And as they all agreed I said: I would now adduce certain passages of Scripture which I have not mentioned before. They are the words spoken with a hidden meaning by Moses the faithful attendant. And thus is it said: Rejoice, ye heavens, along with Him, and let all angels of God worship Him. And I added the rest of the passage as follows: Rejoice, ye Gentiles, with His people, and let all angels of God strengthen Him. Because the blood of His sons is avenged, and He will avenge it, and He will recompense punishment to His enemies, even them that hate Him will He recompense; and the Lord will purge His people’s land.
By saying this He means that we Gentiles rejoice with His people, I mean Abraham and Isaac and Jacob and the prophets, and in fact all from that people who are pleasing to God, in accordance with what you have already conceded to us. But we do not understand by this all who are of your nation, since we know even by Isaiah that the limbs of them that have transgressed are to be devoured by worm and never-ceasing fire, abiding immortal, so that they may be seen of all flesh.Isaiah 66:24
But I wish, Gentlemen, I said, to speak to you, in addition to all this, certain other words from those very words of Moses. For from these you will understand that of old God dispersed all men by their nations and languages; yet out of all the nations He took to Himself your nation, a nation unprofitable and disobedient and unbelieving; and He showed that those who were chosen from every nation have obeyed His will through Christ, whom He calls Jacob and names Israel, so these (believers on Christ) must also be both Jacob and Israel, as I said before at some length.
For in saying: Rejoice, ye Gentiles, with His people, He apportions to them the like inheritance, and gives to them the like nomenclature. But when He says that as Gentiles they are even rejoicing with His people, He says it to the reproach of your nation. For in the same way that you provoked Him by committing idolatry, so also has He deemed them, though idolators, worthy to know His will, and to inherit the inheritance that is with Him.