Mattityahu 7:13-20

Enter through the derech (way) of the shaar hatzarut (gate of narrowness), for wide is the delet and broad is the rekhov (street) leading to Avaddon (destruction, hell, Abaddon), and rabbim (many) are they who enter through it. But tzar (narrow) is the delet and constricted is the Derech (Way) that leads to Chayyim (life) and few are the ones finding it. Beware of the neviei hasheker (false prophets), who come to you in the malbush (clothing) of kevasim (sheep), but within are ravenous ze'evim (wolves). By their perot (fruits) you will have da'as of them. Surely grapes are not gathered from thorns nor figs from thistles, are they? So every etz tov (good tree) produces pri tov (good fruit), but the etz nishchat (corrupt tree) produces pri rah. An etz tov is not able to produce pri rah nor is an etz nishchat able to produce pri tov. Kol etz (every tree) not producing pri tov is cut off and is thrown into HaEish (the Fire). Therefore, by their perot (fruits) you shall have da'as of them.