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

King James Bible
And the thing which he did displeased the LORD: wherefore he slew him also.

American Standard Version
And the thing which he did was evil in the sight of Jehovah: and he slew him also.

Darby Bible Translation
And the thing which he did was evil in the sight of Jehovah, and he slew him also.

Douay-Rheims Bible
And therefore the Lord slew him, be- cause he did a detestable thing.

English Revised Version
And the thing which he did was evil in the sight of the LORD: and he slew him also.

Young's Literal Translation
and that which he hath done is evil in the eyes of Jehovah, and He putteth him also to death.