Beware of false prophets

Matthew 7:15-20King James Version (KJV)

¹⁵ Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
¹⁶ Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
¹⁷ Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
¹⁸ A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
¹⁹ Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
²⁰ Wherefore by their fruits ye shall know them.