Anger is not in itself sinful

Jesus was angry with the Pharisees

"He looked around at them in anger and, deeply distressed at their stubborn hearts, said to the man, "Stretch out your hand." He stretched it out, and his hand was completely restored" (Mark 3:5).

God is angry with the wicked

"God is a righteous judge, a God who expresses his wrath every day" (Psalm 7:11).

Cain's anger turned into hate and murder

Read (Genesis 4:3-8)

Hot words stir up strife

"A gentle answer turns away wrath, but a harsh word stirs up anger" (Proverbs 15:1).

A hot-tempered man creates dissension

"A hot-tempered man stirs up dissension, but a patient man calms a quarrel" (Proverbs 15:18).

Fits of rage and anger belong to our sinful nature

"The acts of the sinful nature are obvious: sexual immorality, impurity and debauchery; idolatry and witchcraft; hatred, discord, jealousy, fits of rage, selfish ambition, dissensions, factions and envy; drunkenness, orgies, and the like. I warn you, as I did before, that those who live like this will not inherit the kingdom of God" (Galatians 5:19-21).

Through the Spirit, we can overcome the sin of a hot temper

"But the fruit of the Spirit is love, joy, peace, patience, kindness, goodness, faithfulness, gentleness and self-control. Against such things there is no law. Those who belong to Christ Jesus have crucified the sinful nature with its passions and desires. Since we live by the Spirit, let us keep in step with the Spirit" (Galatians 5:22-25).

Be slow to become angry

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

Overlook an offense

"Starting a quarrel is like breaching a dam; so drop the matter before a dispute breaks out" (Proverbs 17:14).

"A man’s wisdom gives him patience; it is to his glory to overlook an offense" (Proverbs 19:11).

Handle anger in a godly way.  Resolve anger quickly

"In your anger do not sin": Do not let the sun go down while you are still angry..." (Ephesians 4:26).