Genesis 38:3-7
38:3 She became pregnant and had a son. Judah named him Er.
38:4 She became pregnant again and had another son, whom she named Onan.
38:5 Then she had yet another son, whom she named Shelah. She gave birth to him in Kezib.
38:6 Judah acquired a wife for Er his firstborn; her name was Tamar.
38:7 But Er, Judah’s firstborn, was evil in the Lord’s sight, so the Lord killed him.