So Judah instructed Onan, "You are to have sexual relations with your dead brother's wife, performing the duty of a brother-in-law with her, and have offspring for your brother."

After this, Judah told his daughter-in-law Tamar, "Go live as a widow in your father's house until my son Shelah grows up." But he was really thinking, ""otherwise, Shelah might die like his brothers." So Tamar left and lived in her father's house.

Lot then went out and told his sons-in-law (they had married his daughters), "Get out of here! The LORD is going to destroy this city!" But his sons-in-law thought he was joking.