Genesis 38:7

⁵And she yet again conceived, and bare a son; and called his name Shelah: and he was at Chezib, when she bare him.

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

— Genesis 38:7 —

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.