4 And she conceived again, and bore a son; and she called his name Onan.
5 And she yet again conceived, and bore a son; and called his name Shelah: and he was at Chezib, when she bore him.
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 your brother's wife, and marry her, and raise up descendants to your brother.
9 And Onan knew that the descendant would 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 a descendant to his brother.
10 And the thing which he did displeased the LORD: therefore he slew him also.