4 And she conceived again, and bare a son; and she called his name Onan.
5 And she yet again bare a son, and called his name Shelah: and he was at Chezib, when she bare him.
6 And Judah took a wife for Er his firstborn, and her 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 perform the duty of an husband's brother unto 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 he should give seed to his brother.
10 And the thing which he did was evil in the sight of the LORD: and he slew him also.