Matthew 7:16-20 KJV:
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.