Matthew only. Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. The similarity between the fruit and the nature of the tree extends not only to the species, but also to the specimen.
Good tree ( δένδρον ἀγαθόν); intrinsically sound. Good fruit ( καρποὺς καλούς); attractive in the eyes of men. As is the inner character of the tree, so is the obvious nature of the fruit. But a corrupt tree ( τὸ δὲ σαπρὸν δένδρον); "the" picturing it.
Corrupt; unsound, rotten, worthless (cf. Matthew 13:48); also in the moral world (Ephesians 4:29).