Genesis 26:28-30

28They said, “We see clearly that the Lord has been with you; so we said, ‘There should now be an oath between us [with a curse for the one who breaks it], that is, between you and us, and let us make a covenant (binding agreement, solemn promise) with you,

29that you will not harm us, just as we have not touched you and have done nothing but good to you and have sent you away in peace. You are now the blessed and favored of the Lord!’ ”

30Then Isaac held a [formal] banquet (covenant feast) for them, and they ate and drank.