Genesis 38:10

10 And what he did was evil in the eyes of the Lord, so that he put him to death, like his brother.

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 Onan, Go in to your brother's wife and do what it is right for a husband's brother to do; make her your wife and get offspring for your brother.

9 But Onan, seeing that the offspring would not be his, went in to his brother's wife, but let his seed go on to the earth, so that he might not get offspring for his brother.

10 And what he did was evil in the eyes of the Lord, so that he put him to death, like his brother.

11 Then Judah said to Tamar, his daughter-in-law, Go back to your father's house and keep yourself as a widow till my son Shelah becomes a man: for he had in his mind the thought that death might come to him as it had come to his brothers. So Tamar went back to her father's house.

12 And after a time, Bath-shua, Judah's wife, came to her end; and after Judah was comforted for her loss, he went to Timnah, where they were cutting the wool of his sheep, and his friend Hirah of Adullam went with him.