Deuteronomy 29:12-15

29:12 so that you may enter by oath into the covenant the Lord your God is making with you today. 29:13 Today he will affirm that you are his people and that he is your God, just as he promised you and as he swore by oath to your ancestors Abraham, Isaac, and Jacob. 29:14 It is not with you alone that I am making this covenant by oath, 29:15 but with whoever stands with us here today before the Lord our God as well as those not with us here today.