Genesis 38:1-5

About that time, Judah separated from his brothers and went to stay with a man in Adullam named Hirah. While there, Judah met the daughter of a Canaanite named Shua. He married her, they went to bed, she became pregnant and had a son named Er. She got pregnant again and had a son named Onan. She had still another son; she named this one Shelah. They were living at Kezib when she had him.