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

And it is not possible that the word of God hath failed; for not all who are of Israel are these Israel;

nor because they are seed of Abraham are all children, but--`in Isaac shall a seed be called to thee;'

that is, the children of the flesh--these are not children of God; but the children of the promise are reckoned for seed;

God did not cast away His people whom He knew before; have ye not known--in Elijah--what the Writing saith? how he doth plead with God concerning Israel, saying,

`Lord, Thy prophets they did kill, and Thy altars they dug down, and I was left alone, and they seek my life;'

but what saith the divine answer to him? `I left to Myself seven thousand men, who did not bow a knee to Baal.'

So then also in the present time a remnant according to the choice of grace there hath been;

and if by grace, no more of works, otherwise the grace becometh no more grace; and if of works, it is no more grace, otherwise the work is no more work.

What then? What Israel doth seek after, this it did not obtain, and the chosen did obtain, and the rest were hardened,