Matt 7 16-20

16Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?

17Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.

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

19Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.

20Wherefore by their fruits ye shall know them.