Matthew 5:37

5:37 Let your word be ‘Yes, yes’ or ‘No, no.’ More than this is from the evil one. ¹ 

Matthew 7:17-18

7:17 In the same way, every good tree bears good fruit, but the bad ²  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 9:4

9:4 When Jesus saw their reaction he said, “Why do you respond with evil in your hearts?

[5:37]  ¹ tn The term πονηροῦ (ponhrou) may be understood as specific and personified, referring to the devil, or possibly as a general reference to evil. It is most likely personified, however, since it is articular (τοῦ πονηροῦ, tou ponhrou). Cf. also “the evildoer” in v. 39, which is the same construction.

[7:17]  ² tn Grk “rotten.” The word σαπρός, modifying “tree” in both v. 17 and 18, can also mean “diseased” (L&N 65.28).