(1) "If there arises among you a prophet or a dreamer of dreams, and he gives you a sign or a wonder, (2) and the sign or the wonder comes to pass, of which he spoke to you, saying, "Let us go after other gods"—which you have not known—"and let us serve them," (3) you shall not listen to the words of that prophet or that dreamer of dreams, for the LORD your God is testing you to know whether you love the LORD your God with all your heart and with all your soul. (4) You shall walk after the LORD your God and fear Him, and keep His commandments and obey His voice; you shall serve Him and hold fast to Him. (5) But that prophet or that dreamer of dreams shall be put to death, because he has spoken in order to turn you away from the LORD your God, who brought you out of the land of Egypt and redeemed you from the house of bondage, to entice you from the way in which the LORD your God commanded you to walk. So you shall put away the evil from your midst.
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It is a prophetic voice that speaks for God, and His prophets will always have as the basis of their prophecy the commandments of God as evidence. The message they give (predictive or not) will always be in harmony with previously revealed truth, even though the prophet may be breaking new doctrinal ground, which happens now and then.
We can see another difference between a prophet and a priest or minister. The priest or minister conserves old truth and implements new truth given by the prophet. Most of the time new truth will come through a prophet. Under the New Covenant, of course, new truth came through apostles who were about as close to prophets as one can get without being prophets. Paul makes that clear when he lists the offices in the church, listing apostles first and prophets second (Ephesians 4:11). Once we leave the Old Covenant for the New, God uses apostles to announce new truth, and the prophet is moved into a secondary position. However, throughout the Old Testament, new truth or new doctrines came through prophets.
A minister's job is to conserve what has already been given, to hold fast to what was given in the past, and to recognize that new truth comes through an apostle. There is no apostle now, so we should not expect that there will be any new truth. However, if God raises up a prophet, then we also have to recognize that new truth can come through him. He will not break God's pattern. New truth will either come through an apostle or a prophet. The prophet breaks new ground, yet he also conserves the old.
There is a difference between a minister and a prophet. A minister does not give new truth but conserves old truth. The prophet or the apostle will conserve the old and also proclaim the new.
— John W. Ritenbaugh