Genesis 38:9-11

9Now Onan knew that the 12child would not be his; so when he had relations with his brother’s wife, he 3wasted his seed on the ground so that he would not give 4a child to his brother. 10But what he did was displeasing in the sight of the Lord; so He 5took his life also. 11Then Judah said to his daughter-in-law Tamar, “6Remain a widow in your father’s house until my son Shelah grows up”; for he 7thought, “I am afraid that he too may die like his brothers.” So Tamar went and lived in her father’s house.