Genesis 38:4-6

Young's Literal Translation

⁴ and she conceiveth again, and beareth a son, and calleth his name Onan;

⁵ and she addeth again, and beareth a son, and calleth his name Shelah; and he was in Chezib in her bearing him.

⁶ And Judah taketh a wife for Er, his first-born, and her name [is] Tamar;