John Gill Commentary Exodus 32:13

"Remember Abraham, Isaac, and Israel, thy servants, to whom thou swarest by thine own self, and saidst unto them, I will multiply your seed as the stars of heaven, and all this land that I have spoken of will I give unto your seed, and they shall inherit it for ever." — Exodus 32:13 (ASV)

Remember Abraham, Isaac, and Israel, your servants
The covenant he made with them, the promise he had made unto them, with an oath annexed to it:

to whom you swarest by your own self ;
which he did, because he could swear by no greater; and for the confirmation of his covenant and promise, see (Genesis 22:16)

and saidst unto them ;
for what was said to Abraham was repeated and confirmed to Isaac and Jacob:

I will multiply your seed as the stars of heaven ;
multitudes of which are out of sight, and cannot be seen with the naked eye, nor numbered:

and all this land that I have spoken of ;
the land of Canaan, then inhabited by several nations:

will I give unto your seed, and they shall inherit it for ever ;
as long as they are a people, a body politic, and especially while obedient to the divine will; but should they be now cut off, this promise would become of no effect: this is the great argument Moses makes use of, and the most forcible one.