Romans 9:6–8

But it is not as though the word of God has failed. For not all who are descended from Israel belong to Israel, and not all are children of Abraham because they are his offspring, but “Through Isaac shall your offspring be named.” This means that it is not the children of the flesh who are the children of God, but the children of the promise are counted as offspring.

It is not as though God’s word had failed. For not all who are descended from Israel are Israel. Nor because they are his descendants are they all Abraham’s children. On the contrary, “It is through Isaac that your offspring will be reckoned.” In other words, it is not the children by physical descent who are God’s children, but it is the children of the promise who are regarded as Abraham’s offspring.

Now it is not as though the word of God has failed, because not all who are descended from Israel are Israel. Neither is it the case that all of Abraham’s children are his descendants. On the contrary, your offspring will be traced through Isaac. That is, it is not the children by physical descent who are God’s children, but the children of the promise are considered to be the offspring.

Well then, has God failed to fulfill his promise to Israel? No, for not all who are born into the nation of Israel are truly members of God’s people! Being descendants of Abraham doesn’t make them truly Abraham’s children. For the Scriptures say, “Isaac is the son through whom your descendants will be counted,” though Abraham had other children, too. This means that Abraham’s physical descendants are not necessarily children of God. Only the children of the promise are considered to be Abraham’s children.

But it is not as if the word of God had failed. For not all those who are descended from Israel are truly Israel, nor are they all children because they are descendants of Abraham, but “In Isaac will your descendants be named.” That is, it is not the children by human descent who are children of God, but the children of the promise are counted as descendants.

Not as though the word of God hath taken none effect. For they are not all Israel, which are of Israel: Neither, because they are the seed of Abraham, are they all children: but, In Isaac shall thy seed be called. 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.