Mattityahu (Mat) 7:16-20

You will recognize them by their fruit. Can people pick grapes from thorn bushes, or figs from thistles? Likewise, every healthy tree produces good fruit, but a poor tree produces bad fruit. A healthy tree cannot bear bad fruit, or a poor tree good fruit. Any tree that does not produce good fruit is cut down and thrown in the fire! So you will recognize them by their fruit.