'All Israel' in the Bible

For this reason, let all Israel be certain that this Jesus, whom you put to death on the cross, God has made Lord and Christ.

But it is not as if the word of God was without effect. For they are not all Israel, who are of Israel:

And so all Israel will get salvation: as it is said in the holy Writings, There will come out of Zion the One who makes free; by him wrongdoing will be taken away from Jacob: