Matthew 7:16-18

7:16 You will recognize them by their fruit. Grapes are not gathered from thorns or figs from thistles, are they? 7:17 In the same way, every good tree bears good fruit, but the bad tree bears bad fruit. 7:18 A good tree is not able to bear bad fruit, nor a bad tree to bear good fruit.

Matthew 12:33-34

Trees and Their Fruit

12:33 “Make a tree good and its fruit will be good, or make a tree bad and its fruit will be bad, for a tree is known by its fruit. 12:34 Offspring of vipers! How are you able to say anything good, since you are evil? For the mouth speaks from what fills the heart.

Matthew 15:19

15:19 For out of the heart come evil ideas, murder, adultery, sexual immorality, theft, false testimony, slander.