Bible Verses About Church of Israel: A spiritual church within it

Butit isnot as though the word of God hath come to nought. For they are not all Israel, that are of Israel:

neither, because they are Abraham’s seed, are they all children: but, In Isaac shall thy seed be called.

That is, it is not the children of the flesh that are children of God; but the children of the promise are reckoned for a seed.

God did not cast off his people which he foreknew. Or know ye not what the scripture saith of Elijah? how he pleadeth with God against Israel:

Lord, they have killed thy prophets, they have digged down thine altars; and I am left alone, and they seek my life.

But what saith the answer of God unto him? I have left for myself seven thousand men, who have not bowed the knee to Baal.

Even so then at this present time also there is a remnant according to the election of grace.

But if it is by grace, it is no more of works: otherwise grace is no more grace.

What then? That which Israel seeketh for, that he obtained not; but the election obtained it, and the rest were hardened: