Genesis 38:9
World English Bible (WEB)
"Onan knew that the seed wouldn't be his; and it happened, when he went in to his brother's wife, that he spilled it on the ground, lest he should give seed to his brother."
About Genesis
The book of beginnings - creation, the fall, the flood, and the patriarchs Abraham, Isaac, Jacob, and Joseph.
Old Testament • Book #1