Genesis 38:8-9 ▼

8 Then Judah said to Onan, “Go in to your brother’s wife, and perform your duty as a brother-in-law to her, and raise up a seed for your brother.”

9 And Onan knew that the seed would not be his; and it happened that when he went in to his brother’s wife, he wasted it on the ground in order not to give seed to his brother.