GENESIS 20

ABRAHAM LIES TO KING ABIMELECH 

Abraham is traveling and lies about Sarah being his sister to Abimelech, King of Gerar. Abimelech has a dream where he learns the truth about Abraham and Sarah and does not sleep with her.

God tells Abimelech that Abraham is a prophet or messenger of God. Abimelech is unable to have children, so Abraham prays for him, and God heals Abimelech from infertility.