15 “Watch out for false prophets who come to you in sheep’s clothing, but inside they are swindling wolves. 16 You’ll all know who they are if you observe their fruit. Does anyone pick grapes from thorn bushes or figs from thistles? 17 Similarly, every good tree produces good fruit, but the bad tree produces evil fruit. 18 A good tree can’t produce bad fruit and a bad tree can’t produce good fruit. 19 [ref]Every tree that doesn’t produce good fruit will be chopped down and thrown in the fire. 20 [ref]So then, you’ll know the false teachers by observing their fruit.