'False Prophets' in the Bible

And beware of false prophets, who come to you in sheeps clothing, but inwardly they are ravenous wolves.

and then will many take offense, and betray one another, and hate one another: and many false prophets will rise up and deceive many:

for there shall rise up false Christs, and false prophets, who shall shew great signs and prodigies, so as to deceive, if possible, even the elect.