Genesis 38:10
What he did was wicked in the sight of the LORD, so He put Onan to death as well.
What he did was wicked in the sight of the LORD,

Onan knowingly refused the duty Judah had assigned him to raise up an heir for his dead brother through Tamar. Though he took the privileges of marriage, he deliberately withheld the offspring that would preserve Er’s name and secure Tamar’s place within the family. The later law of levirate marriage required a surviving brother to protect his brother’s inheritance and widow (Deuteronomy 25:5–10). Onan’s sin involved selfishness, deception, and contempt for the family responsibilities through which God preserved the promised line.

1Ki 11:6 So Solomon did evil in the sight of the LORD;…
1Ki 15:26 And he did evil in the sight of the LORD…
2Ki 21:2 And he did evil in the sight of the LORD…

so He put Onan to death as well.

Onan followed his brother Er in receiving immediate divine judgment for persistent wickedness. God’s action revealed His concern for righteousness within Judah’s household and for the vulnerable Tamar, whose future was being denied. The judgment also warned Israel that covenant responsibilities could not be treated lightly. Yet God would later bring grace out of this broken family: Tamar became an ancestor of David and of Jesus Christ (Matthew 1:3).

Lev 10:1-2 Now Aaron’s sons Nadab and Abihu took their censers,…
Num 16:31-35 As soon as Moses had finished saying all this,…
Act 5:1-11 Now a man named Ananias, together with his wife…

Persons / Places / Events
1. Onan
The second son of Judah, who was instructed to perform the duty of a brother-in-law to Tamar, his deceased brother's wife, by providing offspring for his brother.

2. Judah
The father of Onan, a patriarch of one of the twelve tribes of Israel, who plays a significant role in the account of Genesis 38.

3. Tamar
The widow of Er, Onan's brother, who was to be given offspring through Onan according to the custom of levirate marriage.

4. The LORD
The covenant God of Israel, who judges Onan's actions as wicked.

5. Levirate Marriage
A cultural practice in ancient Israel where a man was required to marry his deceased brother's widow to produce offspring in his brother's name.
Teaching Points
The Seriousness of Sin
Onan's actions were not just a personal failure but a direct disobedience to God's covenantal expectations. This reminds us of the gravity of sin and its consequences.

God's Justice
The swift judgment on Onan underscores God's commitment to justice and righteousness. It serves as a reminder that God sees and judges the intentions of the heart.

Faithfulness to Duty
Onan's refusal to fulfill his duty to Tamar highlights the importance of faithfulness and integrity in our responsibilities, especially those that impact others.

The Role of Intentions
Onan's actions were judged not just by what he did, but by the intentions behind them. This teaches us to examine our motives in our actions.

God's Sovereign Plan
Despite human failure, God's purposes prevail. Tamar's inclusion in the lineage of Christ shows God's ability to work through imperfect situations.
Bible Study Questions
1. What does Onan's account teach us about the importance of fulfilling our responsibilities, especially in family and community contexts?

2. How does the concept of levirate marriage in Genesis 38 relate to the broader biblical theme of redemption and restoration?

3. In what ways can we ensure that our intentions align with our actions, and why is this important in our walk with God?

4. How does the account of Onan and Tamar challenge us to consider the consequences of our actions and the seriousness of sin?

5. Reflect on a time when you saw God's justice or mercy in a situation. How does this account of Onan help you understand God's character better?
Connections to Other Scriptures
Deuteronomy 25:5-10
This passage outlines the law of levirate marriage, which provides context for Onan's obligation to Tamar.

Matthew 1:3
This genealogy of Jesus includes Tamar, highlighting her significance in the lineage of Christ despite the events of Genesis 38.

Romans 6:23
This verse speaks to the consequences of sin, which is relevant to understanding the judgment that fell upon Onan.

1 Corinthians 6:9-10
This passage lists behaviors that are considered unrighteous, providing a broader biblical context for understanding what is deemed wicked in God's sight.
LessonsG. Hughes, B. D.Genesis 38:8-10
Onan's SinM. M. Kalisch, Ph. D.Genesis 38:8-10
The Sin of OnanT. H. Leale.Genesis 38:8-10
The Goodness and Severity of GodR.A. Redford Genesis 38
People
Canaanitish, Er, Hirah, Onan, Perez, Pharez, Shelah, Shua, Shuah, Tamar, Timnah, Zarah, Zerah
Places
Chezib, Enaim, Timnah
Topics
Brother, Death, Displeased, Displeasing, Evil, Killed, Lord's, Putteth, Sight, Slew, Wherefore
Dictionary of Bible Themes
Genesis 38:6-11

     5661   brothers
     5737   sisters

Genesis 38:6-26

     5674   daughters

Genesis 38:8-10

     5681   family, nature of
     5714   men
     7388   kinsman-redeemer

Library
Because, Therefore, Lying Heretics Find not in the Books of the New Testament Any...
29. Because, therefore, lying heretics find not in the books of the New Testament any precedents of lying which are meet to be imitated, they esteem themselves to be most copious in their disputation wherein they opine that it is right to lie, when from the old prophetical books, because it doth not appear therein, save to the few who understand, to what must be referred the significative sayings and doings which as such be true, they seem to themselves to find out and allege many that be lies. But
St. Augustine—Against Lying

Cix. Jewish Rulers Seek to Ensnare Jesus.
(Court of the Temple. Tuesday, April 4, a.d. 30.) Subdivision B. Sadducees Ask About the Resurrection. ^A Matt. XXII. 23-33; ^B Mark XII. 18-27; ^C Luke XX. 27-39. ^a 23 On that day there came { ^b come} unto him ^c certain of the the Sadducees, they that { ^b who} say there is no resurrection [As to the Sadducees, see p. 71. We may regard their attitude toward Christ as expressed by their leader Caiaphas, see p. 528]; and they asked him, saying, 19 Teacher, Moses wrote unto us [See Deut. xxv. 5,
J. W. McGarvey—The Four-Fold Gospel

Annunciation to Joseph of the Birth of Jesus.
(at Nazareth, b.c. 5.) ^A Matt. I. 18-25. ^a 18 Now the birth [The birth of Jesus is to handled with reverential awe. We are not to probe into its mysteries with presumptuous curiosity. The birth of common persons is mysterious enough (Eccl. ix. 5; Ps. cxxxix. 13-16), and we do not well, therefore, if we seek to be wise above what is written as to the birth of the Son of God] of Jesus Christ was on this wise: When his mother Mary had been betrothed [The Jews were usually betrothed ten or twelve months
J. W. McGarvey—The Four-Fold Gospel

Genesis
The Old Testament opens very impressively. In measured and dignified language it introduces the story of Israel's origin and settlement upon the land of Canaan (Gen.--Josh.) by the story of creation, i.-ii. 4a, and thus suggests, at the very beginning, the far-reaching purpose and the world-wide significance of the people and religion of Israel. The narrative has not travelled far till it becomes apparent that its dominant interests are to be religious and moral; for, after a pictorial sketch of
John Edgar McFadyen—Introduction to the Old Testament

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