Genesis 38:8 KJV
And Judah said unto Onan, Go in unto thy brother’s wife, and marry her, and raise up seed to thy brother.
Genesis 38:8, King James Version
In context
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.
9 And 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.