'Posterity' in the Bible

who, as regards His human descent, belonged to the posterity of David,

Again, the promise that he should inherit the world did not come to Abraham or his posterity conditioned by Law, but by faith-righteousness.

Under utterly hopeless circumstances he hopefully believed, so that he might become the forefather of many nations, in agreement with the words "Equally numerous shall your posterity be."

nor because they are Abraham's true children. But the promise was "Through Isaac shall your posterity be reckoned."

In other words, it is not the children by natural descent who count as God's children, but the children made such by the promise are regarded as Abraham's posterity.

I ask then, Has God cast off His People? No, indeed. Why, I myself am an Israelite, of the posterity of Abraham and of the tribe of Benjamin.