'Posterity' in the Bible
In fulfillment of His promises to our forefathers--For Abraham and his posterity for ever."
"You are the heirs of the Prophets, and of the Covenant which God made with your forefathers when He said to Abraham, 'And through your posterity all the families of the world shall be blessed.'
But he gave him no inheritance in it, no, not a single square yard of ground. And yet He promised to bestow the land as a permanent possession on him and his posterity after him--and promised this at a time when Abraham was childless.
And God declared that Abraham's posterity should for four hundred years make their home in a country not their own, and be reduced to slavery and be oppressed.
In His humiliation justice was denied Him. Who will make known His posterity? For He is destroyed from among men."
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.