Proverbs 24:8; Proverbs 24:17-18; Proverbs 24:29

8 He who plots evil will be known as a schemer.
17 Do not gloat when your enemy falls; when he stumbles, do not let your heart rejoice, 18 or the LORD will see and disapprove and turn his wrath away from him.
29 Do not say, "I'll do to him as he has done to me; I'll pay that man back for what he did."