Even as Abraham "believed God, and it was ascribed to him for righteousness."

Understand, therefore, that they which are of faith, the same are the children of Abraham.

For the scripture saw aforehand, that God would justify the heathen through faith, and therefore showed beforehand glad tidings unto Abraham: "In thee shall all nations be blessed."

So then, they which be of faith are blessed with faithful Abraham.

that the blessing of Abraham might come on the gentiles through Jesus Christ, and that we might receive the promise of the spirit through faith.

To Abraham and his seed were the promises made. He saith not, "in the seeds," as in many: But, "in thy seed," as in one, which is Christ.

Here is what I am saying: The Agreement originally made by God [with Abraham], with its attending promises, was not canceled when the law of Moses was given some four hundred and thirty years later.

For if the inheritance come of the law, it cometh not of promise: but God gave it unto Abraham by promise.

Now the mediator or go-between [in a transaction] is not [needed] for just one party; whereas God is only one [and was the only One giving the promise to Abraham, but the Law was a contract between two, God and Israel; its validity depended on both].

If ye be Christ's, then are ye Abraham's seed, and heirs by promise.

For it is written that Abraham had two sons, the one by a bondmaid, the other by a free woman.

Now, brothers, you [Christians] are children of the promise [made to Abraham. See 3:29] just like Isaac, [Abraham's son] was.

What does the Scripture say about this matter? [It says, Gen. 21:10-12], "Get rid of the slave woman [Hagar], with her son [Ishmael]; for the son of the slave woman [Ishmael] will not inherit [what God promised to Abraham and his descendants], along with the son of the free woman [i.e., Isaac]."