Prophets are mouthpieces inspired by another
EX 4:15 And thou shalt speak unto him, and put words in his mouth: and I will be with thy mouth, and with his mouth, and will teach you what ye shall do.
EX 7:1 And the LORD said unto Moses, See, I have made thee a god to Pharaoh: and Aaron thy brother shall be thy prophet.
Prophet
H5030
נביא
nâbîy'
naw-bee'
From H5012; a prophet or (generally) inspired man: - prophecy, that prophesy, prophet.
Since prophets are inspired mouthpieces, Moses would have to be the major prophet of scripture (the Jewish religious books that Jesus referred to since no NT existed) inspired by God
EX 4:12 Now therefore go, and I will be with thy mouth, and teach thee what thou shalt say.
Moses admitted to being a prophet of God
DEUT 18:15 The LORD thy God will raise up unto thee a Prophet from the midst of thee, of thy brethren, like unto me; unto him ye shall hearken;
Moses prophesied that another prophet like himself would be raised up by God
DEUT 18:18 I will raise them up a Prophet from among their brethren, like unto thee, and will put my words in his mouth; and he shall speak unto them all that I shall command him.
The prophecy of Moses was not fulfilled until Jesus.
DEUT 34:10 And there arose not a prophet since in Israel like unto Moses, whom the LORD knew face to face,
Moses prophesied of Jesus
JN 5:46 For had ye believed Moses, ye would have believed me; for he wrote of me.
Deut 34:10 confirms that Moses fits the requirement of your question.