Ephesians 4:26

(15) Be (k) ye angry, and sin not: let not the sun go down (l) upon your wrath:

(15) He teaches us how to bridle our anger in such a way that, even though our anger is fierce, yet it does not break out, and that it is without delay quenched before we sleep. And this is so that Satan may not take occasion to give us evil counsel through the wicked counsellor, and destroy us.

(k) If it so happens that you are angry, yet do not sin, that is, bridle your anger, and do not wickedly do that which you have wickedly conceived.

(l) Let not the night come upon you in your anger, that is, make atonement quickly, for all matters.