Genesis 26:4

I will make thy seed to multiply Here we find a renewal to Isaac of all God's promises made to Abraham; and the great fundamental mysterious promise is renewed exactly in the same words in which it had been given to Abraham. When God said to Abraham, In thy seed shall all the nations of the earth be blessed Perhaps Abraham might, at first, suppose God spake of his immediate seed, namely, of Isaac; but when he came upon the stage of life, he brought no such blessing with him; and when the promise was renewed to him in the very same words, it became evident that the seed which was to be this universal blessing was still to come.