Genesis 38:9
But Onan knew that the offspring would not belong to him; so whenever he would sleep with his brother's wife, he would spill his seed on the ground so that he would not produce offspring for his brother.
But Onan knew that the offspring would not belong to him;

Under the customary duty later codified in Deuteronomy 25:5–6, a surviving brother was to raise up an heir for his deceased brother. Such a son would preserve Er’s name, inheritance, and place within the covenant family rather than enlarge Onan’s own line.

Deu 25:6 The first son she bears will carry on the name…
Rut 4:5 Then Boaz said, “On the day you buy the land……
Rut 4:10 Moreover, I have acquired Ruth the Moabitess,…

so whenever he would sleep with his brother’s wife,

Judah had given Tamar to Onan after Er’s death so that Onan might fulfill this family obligation. Onan accepted the privileges of marriage with Tamar while refusing the responsibility attached to it.

Deu 25:5 When brothers dwell together and one of them dies…
Mat 22:24 “Teacher,” they said, “Moses declared that if a man dies……
Lev 18:16 You must not have sexual relations with your brother’s wife;…

he would spill his seed on the ground

Onan deliberately prevented conception. His sin was not the marital union itself, but his calculated refusal to provide an heir for his brother while using Tamar for his own purposes.

Lev 15:16 When a man has an emission of semen, he must bathe…
Lev 15:17 Any clothing or leather on which there is an emission…
Lev 15:18 If a man lies with a woman and there is an emission of semen…

so that he would not produce offspring for his brother.

Onan’s conduct revealed selfish contempt for his brother’s memory, Tamar’s future, and the family duty entrusted to him. God’s purposes for Judah’s line would not fail, and Tamar would ultimately bear descendants through Judah, including the royal line that led to David and, according to the flesh, to Christ.

Deu 25:7 But if the man does not want to marry his brother’s widow…
Deu 25:8 Then the elders of his city shall summon him.…
Deu 25:9-10 his brother’s widow shall go up to him in the presence…

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 Er's widow, by providing offspring for his brother.

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

3. Judah
The father of Er and Onan, who instructed Onan to fulfill his duty to Tamar.

4. Levirate Marriage
A cultural practice where a man is required to marry his deceased brother's widow to produce offspring in the brother's name.

5. Canaan
The region where these events took place, highlighting the cultural and familial obligations of the time.
Teaching Points
Understanding Duty and Responsibility
Onan's actions reflect a failure to fulfill his familial and cultural responsibilities. As Christians, we are called to honor our commitments and responsibilities to others.

The Consequences of Selfishness
Onan's decision was driven by self-interest, leading to his downfall. This serves as a reminder of the destructive nature of selfishness and the importance of selflessness in our relationships.

The Sanctity of Sexual Relations
Onan's misuse of his sexual relationship with Tamar highlights the importance of respecting the sanctity of sexual relations as designed by God.

God's Sovereignty and Justice
Despite human actions, God's plans and justice prevail. Onan's account reminds us that God sees and judges the intentions of the heart.

Cultural Practices and God's Law
While cultural practices like levirate marriage were significant, they must be understood in light of God's overarching moral law and intentions.
Bible Study Questions
1. What were the cultural and familial obligations that Onan was expected to fulfill, and how do they compare to our responsibilities today?

2. How does Onan's account illustrate the consequences of acting out of selfish motives rather than fulfilling one's duty?

3. In what ways can we ensure that our actions align with God's intentions, especially in our relationships with others?

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

5. Reflect on a time when you faced a difficult responsibility. How did your faith guide you in fulfilling it, and what can you learn from Onan's failure to do so?
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 22:24-28
Jesus references the practice of levirate marriage when questioned by the Sadducees, showing its continued relevance in Jewish thought.

1 Corinthians 6:18-20
Paul speaks about the sanctity of the body and sexual purity, which can be related to Onan's misuse of his sexual relationship with Tamar.
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, Brother's, Destroyed, Frustrated, Ground, Knoweth, Lay, Lest, Offspring, Onan, Order, Pass, Producing, Purpose, Reckoned, Seed, Seeing, Semen, Spilled, Wasted, Whenever, Wife, Wouldn't
Dictionary of Bible Themes
Genesis 38:6-11

     5661   brothers
     5737   sisters

Genesis 38:6-26

     5674   daughters

Genesis 38:8-9

     5711   marriage, restrictions

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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