Ephesians 4

26 Be angry [at sin—at immorality, at injustice, at ungodly behavior], yet do not sin; do not let your anger [cause you shame, nor allow it to] last until the sun goes down. [Ps 4:4] 27 And do not give the devil an opportunity [to lead you into sin by holding a grudge, or nurturing anger, or harboring resentment, or cultivating bitterness].