Prophecy plays a key role in the Old Testament understanding of hope, particularly that great Messianic hope. Prophecy should be understood as speaking with Divine Authority to convey the message that God wills for a particular audience. We see from the Bible that becoming a prophet was nothing that anyone took upon themselves. It is all Grace, a gift given not for maturity’s sake or for exceptional sanctity. The prophet’s role is that of a speaker, a mouthpiece for God. We see this in Chapter 18 of Deuteronomy where God says “I will put my words in his mouth, and he shall speak to them all that I command him” (Deuteronomy 18:18).
It is also clear from the Old Testament texts that false prophecy is a grave matter, and some rules are given to the Jewish people to discern true and false prophets. In the Old Testament tradition, a true prophet cannot contradict the Torah, preach immorally, or make false predictions.