James 1:19-20
My dear brothers, take note of this: Everyone should be quick to listen, slow to speak and slow to become angry, for man's anger does not bring about the righteous life that God desires.

 

Proverbs 16
Better a patient man than a warrior, a man who controls his temper than one who takes a city.

Ephesians 4:31-32
Get rid of all bitterness, rage and anger, brawling and slander, along with every form of malice. Be kind and compassionate to one another, forgiving each other, just as in Christ God forgave you.

 

Psalm 37:8
Refrain from anger and turn from wrath; do not fret-it leads only to evil.