Genesis 38:10

10 The Lord was displeased by this wicked thing Onan had done, so the Lord killed Onan also.

Genesis 38:10 Meaning and Commentary

Genesis 38:10

And the thing which he did displeased the Lord
Being done out of envy to his brother, and through want of affection to the memory of his name; and it may be out of covetousness to get his estate into his own hands, and especially as it frustrated the end of such an usage of marrying a brother's wife; which appears to be according to the will of God, since it afterwards became a known law of his; and it was the more displeasing, as it was not only a check upon the multiplication of Abraham's seed as promised, but since the Messiah was to come from Judah. This was doing all to hinder it that lay in his power: wherefore he slew him also;
in like manner as he had slain his brother, ( Genesis 38:7 ) .

Genesis 38:10 In-Context

8 Then Judah said to Er's brother Onan, "Go and have sexual relations with your dead brother's wife. It is your duty to provide children for your brother in this way."

9 But Onan knew that the children would not belong to him, so when he was supposed to have sexual relations with Tamar he did not complete the sex act. This made it impossible for Tamar to become pregnant and for Er to have descendants.

10 The Lord was displeased by this wicked thing Onan had done, so the Lord killed Onan also.

11 Then Judah said to his daughter-in-law Tamar, "Go back to live in your father's house, and don't marry until my young son Shelah grows up." Judah was afraid that Shelah also would die like his brothers. So Tamar returned to her father's home.

12 After a long time Judah's wife, the daughter of Shua, died. After Judah had gotten over his sorrow, he went to Timnah to his men who were cutting the wool from his sheep. His friend Hirah from Adullam went with him.