'Promise' in the Bible

For the promise, that he should be the heir of the world, was not to Abraham, or to his seed, through the law, but through the righteousness of faith.

For if they which are of the law be heirs, faith is made void, and the promise made of none effect:

Therefore it is of faith, that it might be by grace; to the end the promise might be sure to all the seed; not to that only which is of the law, but to that also which is of the faith of Abraham; who is the father of us all,

He staggered not at the promise of God through unbelief; but was strong in faith, giving glory to God;

That is, They which are the children of the flesh, these are not the children of God: but the children of the promise are counted for the seed.

For this is the word of promise, At this time will I come, and Sara shall have a son.