Genesis 38:9-11

Wycliffe Bible

⁹ And he knew that sons should not be born to him; and he entered [in] to the wife of his brother, and shedded his seed into the earth, lest the free children should be born by the name of the dead brother; (But Onan knew that any sons who would be born would not be his; so he slept with his brother’s wife, but he poured out his seed onto the ground, so that no children would be born in the name of his dead brother;)

¹⁰ and therefore the Lord smote him (and so the Lord struck him down), for he did (an) abominable thing.

¹¹ Wherefore Judah said to Tamar, his son’s wife, Be thou a widow in the house of thy father, till Shelah my son waxed (until my son Shelah hath grown up); for he dreaded lest also he should die as his brethren (did). And (so) she went, and dwelled in the house of her father.