Deuteronomy 29:12-15

that thou shouldest enter into covenant with the LORD thy God, and into his oath, which the LORD thy God maketh with thee this day: that he may establish thee to day for a people unto himself, and that he may be unto thee a God, as he hath said unto thee, and as he hath sworn unto thy fathers, to Abraham, to Isaac, and to Jacob. Neither with you only do I make this covenant and this oath; but with him that standeth here with us this day before the LORD our God, and also with him that is not here with us this day