Genesis 38:8
8Then Judah said to Onan, “Sleep with your brother’s wife. Perform your duty as her brother-in-law1 and raise up offspring for your brother.”
Translation Notes
1Where is this duty coming from? This law is found in the Torah in Deuteronomy 25:5 but how was Judah aware of it? It came from Enoch, see Jasher 3:26.