Then Judah said to Onan, “Have sexual relations with your brother’s wife and fulfill the duty of a brother-in-law to her so that you may raise up a descendant for your brother.”
But Onan knew that the child would not be considered his. So whenever he had sexual relations with his brother’s wife, he withdrew prematurely so as not to give his brother a descendant.
The Lord will be unwilling to forgive him, and his intense anger will rage against that man; all the curses written in this scroll will fall upon him and the Lord will obliterate his name from memory.
Stand aside and I will destroy them, obliterating their very name from memory, and I will make you into a stronger and more numerous nation than they are.”