'Promise' in the Bible

For not through law is the promise to Abraham, or to his seed, of his being heir of the world, but through the righteousness of faith;

for if they who are of law are heirs, the faith hath been made void, and the promise hath been made useless;

Because of this it is of faith, that it may be according to grace, for the promise being sure to all the seed, not to that which is of the law only, but also to that which is of the faith of Abraham,

and at the promise of God did not stagger in unbelief, but was strengthened in faith, having given glory to God,

that is, the children of the flesh -- these are not children of God; but the children of the promise are reckoned for seed;

for the word of promise is this; 'According to this time I will come, and there shall be to Sarah a son.'