John Gill Commentary Deuteronomy 29:13

"that he may establish thee this day unto himself for a people, and that he may be unto thee a God, as he spake unto thee, and as he sware unto thy fathers, to Abraham, to Isaac, and to Jacob." — Deuteronomy 29:13 (ASV)

That he may establish you this day for a people to
himself, and [that] he may be to you a God
Which contains the sum and substance of the covenant; see (Jeremiah 32:38) ;

as he has said to you, and as he had sworn to your fathers, to
Abraham, to Isaac, and to Jacob ;
(Deuteronomy 26:17Deuteronomy 26:18) (28:9) .