Genesis 38:9-11

21st Century King James Version

⁹ And Onan knew that the seed should not be his; and it came to pass, when he went in unto his brother’s wife, that he spilled it on the ground, lest he should give seed to his brother.

¹⁰ And the thing which he did displeased the Lord; therefore He slew him also.

¹¹ Then said Judah to Tamar his daughter-in-law, “Remain a widow at thy father’s house, until Shelah my son is grown”; for he said, “Lest perhaps he die also, as his brethren did.” And Tamar went and dwelt in her father’s house.