Because of this it is from faith, so that it is according to grace, in order for the promise to be sure to all the seed, not only to the seed from the law, but also to the seed from the faith of Abraham, who is father of us all

For this is the word of promise: At this time I will come, and there will be a son by Sarah.

For God who promised to Abraham, since he had none greater to swear by, swore by himself,