Jerome of Stridon
Someone will ask: where is it written that all Israel will be saved? First, the apostle himself says: when the fullness of the Gentiles has come in, then all Israel will be saved (cf. Rom 9-11, especially 11:26).
Moreover, John says in his Revelation: from the tribe of Judah twelve thousand will believe, from the tribe of Reuben twelve thousand will believe, and the same is said of the other tribes. In all, there will be one hundred forty-four thousand who believe.
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If Israel had believed, our Lord would not have been crucified. If our Lord had not been crucified, salvation would not have come to the multitude of the Gentiles. Therefore the Jews will believe, but they will believe at the end of the world. It was not the time for them to believe in the Cross. If they had believed, the Lord would not have been crucified. It was not the time for them to believe. In their unbelief is our faith; in their fall is our exaltation. It was not their time, so that it might become our time.