That another Prophet such as Moses was promised, to wit, one who should give a new testament, and who rather ought to be heard
In Deuteronomy God said to Moses: “And the Lord said to me, A Prophet will I raise up to them from among their brethren, such as you, and I will give my word in His mouth; and He shall speak unto them that which I shall command Him. And whosoever shall not hear whatsoever things that Prophet shall speak in my name, I will avenge it.” Concerning whom also Christ says in the Gospel according to John: “Search the Scriptures, in which you think you have eternal life. These are they which set forth testimony concerning me; and you will not come to me, that you might have life. Do not think that I accuse you to the Father: there is one that accuses you, even Moses, on whom you hope. For if you had believed Moses, you would also believe me: for he wrote of me. But if you believe not his writings, how shall you believe my words?”
Source: The Treatises of Cyprian (New Advent)