Deuteronomy 31:21
And when many troubles and afflictions have come upon them, this song will testify against them, because it will not be forgotten from the lips of their descendants. For I know their inclination, even before I bring them into the land that I swore to give them."
And when many troubles and afflictions have come upon them,

Israel’s future suffering would arise from covenant unfaithfulness, as warned in Deuteronomy 28. Invasions, famine, exile, and oppression would reveal the destructive fruit of abandoning the Lord. Yet divine judgment would also function as discipline, exposing sin and calling the nation to return to the God who redeemed them.

Deu 28:15 If, however, you do not obey the LORD your God…
Deu 28:45-48 All these curses will come upon you. They will pursue you…
Lev 26:14-17 If, however, you fail to obey Me and to carry out…

this song will testify against them,

The Song of Moses, recorded in Deuteronomy 32, would stand as an enduring witness to God’s faithfulness and Israel’s rebellion. Sung and remembered among the people, it would declare that the Lord had warned them beforehand and had remained righteous in all His dealings. Their own covenant song would silence excuses and summon later generations to repentance.

Psa 50:7 Hear, O My people, and I will speak, O Israel,…
Isa 59:12 For our transgressions are multiplied before You,…
Jer 14:7 Although our iniquities testify against us, O LORD,…

because it will not be forgotten from the lips of their descendants.

God would preserve the song through Israel’s generations, even during seasons of widespread apostasy. The continued remembrance of these words would maintain a public testimony to the Lord’s acts, His covenant, and His claims upon His people. Israel was commanded to teach God’s words diligently within the home, so that each generation would know both the blessings of obedience and the consequences of rebellion.

Isa 59:21 “As for Me, this is My covenant with them,” says the LORD…
Deu 11:19 Teach them to your children, speaking about them…
Psa 78:4-7 We will not hide them from their children…

For I know their inclination,

The Lord knew the bent of Israel’s heart before their entrance into Canaan. Human sin was not hidden from Him, nor did His foreknowledge excuse Israel’s choices. Their need was deeper than external instruction; they required hearts renewed to love and obey God, a work promised through the prophets and fulfilled in the new covenant.

Gen 8:21 When the LORD smelled the pleasing aroma,…
Gen 6:5 Then the LORD saw that the wickedness of man…
Jer 17:9 The heart is deceitful above all things and beyond cure.…

even before I bring them into the land that I swore to give them.”

The land remained God’s faithful gift, secured by His promises to Abraham, Isaac, and Jacob. Israel’s possession of it carried covenant responsibility, for life in the land was to display the holiness and justice of the Lord before the nations. Even with full knowledge of Israel’s coming failure, God continued His redemptive purpose, ultimately providing rest and inheritance through Christ.

Exo 3:8 I have come down to rescue them from the hand of Egyptians…
Exo 3:17 And I have promised to bring you out of your affliction…
Gen 15:18 On that day the LORD made a covenant with Abram…

Persons / Places / Events
1. Moses
The leader of the Israelites who is delivering God's message to the people. He is preparing them for his departure and the transition of leadership to Joshua.

2. The Israelites
The chosen people of God, who are about to enter the Promised Land. They are the recipients of the warnings and instructions given by Moses.

3. The Promised Land
The land of Canaan, which God swore to give to the descendants of Abraham, Isaac, and Jacob. It represents God's faithfulness and the fulfillment of His promises.

4. The Song of Moses
A prophetic song given by God to Moses to teach the Israelites. It serves as a witness against them when they turn away from God.

5. God
The sovereign Lord who knows the hearts of His people and foresees their future disobedience. He provides the song as a means of reminding them of His covenant and their responsibilities.
Teaching Points
The Power of Remembrance
The song serves as a tool for remembrance, reminding the Israelites of God's laws and their covenant with Him. We should also use Scripture to remind ourselves of God's promises and our commitments.

God's Omniscience
God knows the hearts and future actions of His people. We should live with the awareness that nothing is hidden from God, and strive to align our actions with His will.

The Role of Warnings
Just as the song warns the Israelites of the consequences of disobedience, we should heed the warnings in Scripture to avoid spiritual pitfalls.

Generational Faithfulness
The song is meant to be remembered by future generations. We have a responsibility to pass down our faith and the truths of Scripture to the next generation.

The Certainty of God's Promises
Despite knowing the Israelites' future disobedience, God remains faithful to His promise of the land. We can trust in God's faithfulness even when we falter.
Bible Study Questions
1. How does the Song of Moses function as a witness against the Israelites, and what can we learn from this about the role of Scripture in our lives?

2. In what ways does God's foreknowledge of the Israelites' actions impact your understanding of His character and His relationship with His people?

3. How can we ensure that the truths of Scripture are not forgotten by future generations in our own families and communities?

4. What are some modern "songs" or reminders that we can use to keep God's commandments and promises at the forefront of our minds?

5. How do the warnings in Deuteronomy 31:21 relate to the broader biblical account of sin and redemption, and how can this understanding shape our daily walk with God?
Connections to Other Scriptures
Exodus 15
The Song of Moses after the crossing of the Red Sea, which celebrates God's deliverance and serves as a reminder of His power and faithfulness.

Psalm 78
A historical psalm that recounts Israel's repeated disobedience and God's enduring patience and mercy.

Hebrews 4:12
The Word of God is living and active, discerning the thoughts and intentions of the heart, similar to how the song in Deuteronomy serves as a witness to the Israelites' hearts.

Romans 3:23
All have sinned and fall short of the glory of God, reflecting the inherent tendency of the Israelites to stray from God's commands.
JoshuaJ. Orr Deuteronomy 31:3-8, 23
The Authorship of the BookJ. Orr Deuteronomy 31:9, 24-26
The Written WordJ. Orr Deuteronomy 31:9, 24-27
The Honor Appertaining to God's LawD. Davies Deuteronomy 31:9-13, 24-29
The Lord's Charge to Moses and JoshuaR.M. Edgar Deuteronomy 31:14-23
The Official Investiture of JoshuaD. Davies Deuteronomy 31:14, 15, 23
The Last Precaution Against IdolatryD. Davies Deuteronomy 31:16-22, 29
God's Foresight of Israel's DeclensionJ. Orr Deuteronomy 31:16-22, 28-30
People
Amorites, Israelites, Joshua, Levi, Levites, Moses, Nun, Og, Sihon
Places
Jordan River, Moab
Topics
Already, Befallen, Bring, Clear, Confront, Descendants, Developing, Difficulties, Disposed, Distresses, Evils, Face, Forgotten, Form, Forming, Frame, Hearts, Imagination, Imagining, Intent, Lips, Meet, Memories, Mouth, Mouths, Moving, Oath, Overtaken, Pass, Promised, Purposes, Seed, Song, Sware, Swore, Sworn, Testified, Testify, Thoughts, To-day, Troubles, Unforgotten, Witness
Dictionary of Bible Themes
Deuteronomy 31:21

     1020   God, all-knowing
     6186   evil scheming
     9130   future, the

Deuteronomy 31:20-21

     5477   property, land

Library
Pilgrim Song
Gerhard Ter Steegen Deut. xxxi. 8 On, O beloved children, The evening is at hand, And desolate and fearful The solitary land. Take heart! the rest eternal Awaits our weary feet; From strength to strength press onwards, The end, how passing sweet! Lo, we can tread rejoicing The narrow pilgrim road; We know the voice that calls us, We know our faithful God. Come, children, on to glory! With every face set fast Towards the golden towers Where we shall rest at last. It was with voice of singing We
Frances Bevan—Hymns of Ter Steegen, Suso, and Others

First Sunday in Lent
Text: Second Corinthians 6, 1-10. 1 And working together with him we entreat also that ye receive not the grace of God in vain 2 (for he saith, At an acceptable time I hearkened unto thee, and in a day of salvation did I succor thee: behold, now is the acceptable time; behold, now is the day of salvation): 3 giving no occasion of stumbling in anything, that our ministration be not blamed; 4 but in everything commending ourselves, as ministers of God, in much patience, in afflictions, in necessities,
Martin Luther—Epistle Sermons, Vol. II

Josiah, a Pattern for the Ignorant.
"Because thine heart was tender, and thou hast humbled thyself before the Lord, when thou heardest what I spake against this place, and against the inhabitants thereof, that they should become a desolation and a curse, and hast rent thy clothes, and wept before Me; I also have heard thee, saith the Lord. Behold therefore, I will gather thee unto thy fathers, and thou shalt be gathered into thy grave in peace; and thine eyes shall not see all the evil which I will bring upon this place."--2 Kings
John Henry Newman—Parochial and Plain Sermons, Vol. VIII

Never! Never! Never! Never! Never!
Hence, let us learn, my brethren, the extreme value of searching the Scriptures. There may be a promise in the Word which would exactly fit your case, but you may not know of it, and therefore miss its comfort. You are like prisoners in a dungeon, and there may be one key in the bunch which would unlock the door, and you might be free; but if you will not look for it you may remain a prisoner still, though liberty is near at hand. There may be a potent medicine in the great pharmacopia of Scripture,
Charles Haddon Spurgeon—Spurgeon's Sermons Volume 8: 1863

Jesus Makes a Preaching Tour through Galilee.
^A Matt. IV. 23-25; ^B Mark I. 35-39; ^C Luke IV. 42-44. ^b 35 And in the morning, a great while before day, he rose up went out [i. e., from the house of Simon Peter], and departed into a desert place, and there prayed. [Though Palestine was densely populated, its people were all gathered into towns, so that it was usually easy to find solitude outside the city limits. A ravine near Capernaum, called the Vale of Doves, would afford such solitude. Jesus taught (Matt. vi. 6) and practiced solitary
J. W. McGarvey—The Four-Fold Gospel

Deuteronomy
Owing to the comparatively loose nature of the connection between consecutive passages in the legislative section, it is difficult to present an adequate summary of the book of Deuteronomy. In the first section, i.-iv. 40, Moses, after reviewing the recent history of the people, and showing how it reveals Jehovah's love for Israel, earnestly urges upon them the duty of keeping His laws, reminding them of His spirituality and absoluteness. Then follows the appointment, iv. 41-43--here irrelevant (cf.
John Edgar McFadyen—Introduction to the Old Testament

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