1. The wise are not easily angered.

People with understanding control their anger; a hot temper shows great foolishness.

Proverbs 14:29

2. Anger produces unrighteousness. 

Know this, my beloved brothers: let every person be quick to hear, slow to speak, slow to anger; for the anger of man does not produce the righteousness that God requires.

James 1:19-20

3. Harsh words stir up anger.

A soft answer turns away wrath, but a harsh word stirs up anger.

Proverbs 15:1

4. Do not associate with a hot-tempered person.

Do not make friends with a hot-tempered person, do not associate with one easily angered, or you may learn their ways and get yourself ensnared.

Proverbs 22:24-25

5. Do not go to sleep angry, giving the devil a foothold over you. 

“In your anger do not sin”: Do not let the sun go down while you are still angry.

Ephesians 4:26