Genesis 38:6-8

Living Bible

⁶ When his oldest son, Er, grew up, Judah arranged for him to marry a girl named Tamar. ⁷ But Er was a wicked man, and so the Lord killed him.

⁸ Then Judah said to Er’s brother, Onan, “You must marry Tamar, as our law requires of a dead man’s brother; so that her sons from you will be your brother’s heirs.”