Genesis 26:28-31

28And they said, We saw certainly that Jehovah is with thee; and we said, Let there be then an oath between us — between us and thee, and let us make a covenant with thee,

29that thou wilt do us no wrong, as we have not touched thee, and as we have done to thee nothing but good, and have let thee go in peace; thou art now blessed of Jehovah.

30And he made them a feast, and they ate and drank.

31And they rose early in the morning, and swore one to another; and Isaac sent them away, and they departed from him in peace.