Genesis 38:10
And the thing which he did displeased the LORD: wherefore he slew him also.
In other versions
And the thing which he did was evil in the sight of Jehovah: and he slew him also.
ASV
And what he did was evil in the eyes of the Lord, so that he put him to death, like his brother.
BBE
And the thing which he did was evil in the sight of Jehovah, and he slew him also.
DBY
The thing which he did was evil in the sight of Yahweh, and he killed him also.
WEB
and that which he hath done is evil in the eyes of Jehovah, and He putteth him also to death.
YLT
And the thing which he did displeased the LORD: wherefore he slew him also.
ENG
And the thing which he did displeased the LORD: wherefore he slew him also.
WBT
What he did was wicked in the sight of the LORD, so He put Onan to death as well.
BSB
In context
8And Judah said unto Onan, Go in unto thy brother's wife, and marry her, and raise up seed to thy brother.
9And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother's wife, that he spilled it on the ground, lest that he should give seed to his brother.
10And the thing which he did displeased the LORD: wherefore he slew him also.
11Then said Judah to Tamar his daughter in law, Remain a widow at thy father's house, till Shelah my son be grown: for he said, Lest peradventure he die also, as his brethren did. And Tamar went and dwelt in her father's house.
12And in process of time the daughter of Shuah Judah's wife died; and Judah was comforted, and went up unto his sheepshearers to Timnath, he and his friend Hirah the Adullamite.