The Bible contains extensive warnings about false prophets from Genesis to Revelation. Jesus Himself cautioned that they come in sheep's clothing but inwardly are ravenous wolves (Matthew 7:15). A false prophet claims divine authority but teaches what contradicts Scripture, leads people away from God, or makes predictions that fail. Deuteronomy 18:21-22 provides an objective test: if what a prophet speaks does not come true, the Lord has not spoken through them. In the New Testament, the danger intensifies—Jesus warned that false prophets in the last days would perform signs and wonders to deceive even the elect if possible (Matthew 24:24). Second Peter 2:1 warns they will secretly introduce destructive heresies. The primary defense is testing the spirits as 1 John 4:1 commands: examine whether teaching acknowledges Jesus Christ and aligns with apostolic doctrine. Jesus also taught to evaluate by their fruits—the character and conduct of the teacher reveal their true nature. Sound biblical knowledge, community accountability, and the Holy Spirit's guidance protect believers from deception.