Genesis 38:7 KJV

And Er, Judah’s firstborn, was wicked in the sight of the Lord; and the Lord slew him.
Genesis 38:7, King James Version

In context

6 And Judah took a wife for Er his firstborn, whose name was Tamar.

7 And Er, Judah’s firstborn, was wicked in the sight of the Lord; and the Lord slew him.

8 And Judah said unto Onan, Go in unto thy brother’s wife, and marry her, and raise up seed to thy brother.