4And she conceived again, and bare a son; and she called his name Onan.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.10And the thing which he did displeased the LORD: wherefore he slew him also.

12And the sons of Judah; Er, and Onan, and Shelah, and Pharez, and Zerah: but Er and Onan died in the land of Canaan. And the sons of Pharez were Hezron and Hamul.