Genesis 38:8

Genesis 38:8, in plain English

Judah tells Onan to sleep with Tamar to fulfill the custom of raising up offspring for his dead brother.

Why it's here

This is levirate law—a practice where a brother was obligated to marry his brother's widow and produce a son who would carry on the dead brother's name and legacy. It was actually a merciful law, protecting vulnerable widows. Judah is doing what he should do.

Who's speaking

Judah, commanding his second son

Where it sits in the story

Judah looks like a responsible father here, upholding family law. But you're about to see his son refuse, and then you'll see Judah himself fail this widow in a far more serious way. The irony will be stunning.

The scholarly reading

Judah commands Onan to fulfill the levirate obligation—to lie with his brother's widow and produce an heir in Er's name.

Language and setting

The Levirate marriage law (from Latin levir, 'brother-in-law') obligated a deceased man's brother to marry his widow and father children credited to the deceased. This ancient Near Eastern practice, also attested in Hittite and Akkadian texts, served to preserve family property and honor. The Hebrew דְבַר אֶת־אֲחִיךָ (devar et-achika, literally 'speak with/unto your brother') carries legal weight—it's a binding command. Judah's language shows he understands the gravity: the offspring produced would legally belong to Er's estate, not Onan's.

Voice

Judah, commanding his son Onan

Significance

This command establishes the legal and moral framework that will eventually justify Tamar's extraordinary actions—she is not merely a wronged woman but a participant in a sacred duty to perpetuate her husband's name.

6Now Judah acquired a wife for Er, his firstborn, and her name was Tamar.

7But Er, Judah’s firstborn, was wicked in the sight of the LORD; so the LORD put him to death.

8Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law and raise up offspring for your brother.”

9But 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.

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

Read all of Genesis 38 — A strange detour from Joseph's story. Judah's failures and Tamar's boldness both play a role in the ancestry of the Messiah.