Exodus 23:21

“Moreover, in the book of Exodus we have also perceived that the name of God Himself which, He says, was not revealed to Abraham or to Jacob, was Jesus, and was declared mysteriously through Moses. Thus it is written: ‘And the Lord spake to Moses, Say to this people, Behold, I send My angel before thy face, to keep thee in the way, to bring thee into the land which I have prepared for thee. Give heed to Him, and obey Him; do not disobey Him. For He will not draw back from you; for My name is in Him.’ Now understand that He who led your fathers into the land is called by this name Jesus, and first called Auses (Oshea). For if you shall understand this, you shall likewise perceive that the name of Him who said to Moses, ‘for My name is in Him,’ was Jesus. For, indeed, He was also called Israel, and Jacob’s name was changed to this also. …

“But if the Christ,” say they, “who is believed to be coming is not called Jesus, why is he who is come called Jesus Christ?” Well, each name will meet in the Christ of God, in whom is found likewise the appellation Jesus. Learn the habitual character of your error. In the course of the appointing of a successor to Moses, Oshea the son of Nun is certainly transferred from his pristine name, and begins to be called Jesus. Certainly, you say. This we first assert to have been a figure of the future. …

Now if he caught at the name Christ , just as the pickpocket clutches the dole-basket, why did he wish to be called Jesus too, by a name which was not so much looked for by the Jews? For although we, who have by God’s grace attained to the understanding of His mysteries, acknowledge that this name also was destined for Christ, yet, for all that, the fact was not known to the Jews, from whom wisdom was taken away. To this day, in short, it is Christ that they are looking for, not Jesus; and they interpret Elias to be Christ rather than Jesus. He, therefore, who came also in a name in which Christ was not expected, might have come only in that name which was solely anticipated for Him. But since he has mixed up the two, the expected one and the unexpected, his twofold project is defeated. …

19. Let the Jews say what prophet is meant in this promise of God to Moses: "I will raise up unto them a Prophet from among their brethren, like unto thee." Many prophets appeared after Moses; but one in particular is here pointed out. The Jews will perhaps naturally think of the successor of Moses, who led into the promised land the people that Moses had brought out of Egypt. Having this successor of Moses in his mind, he may perhaps laugh at me for asking to what prophet the words of the promise refer, since it is recorded who followed Moses in ruling and leading the people. …