Matthew 7:15-20

15 "Beware of false prophets, who come to you in sheep's clothing, but inwardly are ravening wolves.

16 By their fruits you will know them. Do you gather grapes from thorns, or figs from thistles?

17 Even so, every good tree brings forth good fruit; but the corrupt tree brings forth evil fruit.

18 A good tree can't bring forth evil fruit, neither can a corrupt tree bring forth good fruit.

19 Every tree that doesn't grow good fruit is cut down, and thrown into the fire.

20 Therefore, by their fruits you will know them.