Genesis 38:7-10 ▼

7 But Er, Judah’s firstborn, was evil in the sight of Yahweh, so Yahweh put him to death.

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.

10 But what he did was displeasing in the sight of Yahweh; so He put him to death also.