Genesis 21:22-23

22At that time Phicol was the leader of King Abimelech's army. Abimelech and Phicol said to Abraham, ‘We see that God helps you in everything that you do.

23So please make a promise to me in front of God. Promise that you will never deceive me, or my children, or my descendants. You are living here in this land as a stranger. I have been kind to you, so please show that you will also be kind to us.’