Genesis 38:2-5

2There Judah met the daughter of a Canaanite man named Shua. He married her and made love to her; 3she became pregnant and gave birth to a son, who was named Er. 4She conceived again and gave birth to a son and named him Onan.

5She gave birth to still another son and named him Shelah. It was at Kezib that she gave birth to him.