Refrain from anger, and forsake wrath! Fret not yourself; it tends only to evil (Ps 37:8).
When words are many, transgression is not lacking, but whoever restrains his lips is prudent (Pr 10:19).
The desire of the righteous ends only in good, the expectation of the wicked in wrath (Pr 11:23).
For every kind of beast and bird, of reptile and sea creature, can be tamed and has been tamed by mankind, but no human being can tame the tongue. It is a restless evil, full of deadly poison. With it we bless our Lord and Father, and with it we curse people who are made in the likeness of God. From the same mouth come blessing and cursing. My brothers, these things ought not to be so (Jam 3:7-10).
1 John 2:9
Whoever says he is in the light and hates his brother is still in darkness (1 Jn 2:9).
1 John 4:20
If anyone says, “I love God,” and hates his brother, he is a liar; for he who does not love his brother whom he has seen cannot love God whom he has not seen (1 Jn 4:20).
Whoever is slow to anger has great understanding, but he who has a hasty temper exalts folly (Pr 14:29).
Whoever is slow to anger is better than the mighty, and he who rules his spirit than he who takes a city (Pr 16:32).
Whoever restrains his words has knowledge, and he who has a cool spirit is a man of understanding (Pr 17:27).
For an overseer, as God’s steward, must be above reproach. He must not be arrogant or quick-tempered or a drunkard or violent or greedy for gain (Tit 1:7).
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 of God (Jam 1:19-20).
If anyone thinks he is religious and does not bridle his tongue but deceives his heart, this person’s religion is worthless (Jam 1:26).
Be not quick in your spirit to become angry, for anger lodges in the heart of fools (Ecc 7:9).
Remove vexation from your heart, and put away pain from your body, for youth and the dawn of life are vanity (Ecc 11:10).
Fathers, do not provoke your children, lest they become discouraged. (Col 3:21)
But I say to you that everyone who is angry with his brother will be liable to judgment; whoever insults his brother will be liable to the council; and whoever says, ‘You fool!’ will be liable to the hell of fire. So if you are offering your gift at the altar and there remember that your brother has something against you, leave your gift there before the altar and go. First, be reconciled to your brother, and then come and offer your gift (Mt 5:22-24).
1 Corinthians 1:10
I appeal to you, brothers, by the name of our Lord Jesus Christ, that all of you agree, and that there be no divisions among you, but that you be united in the same mind and the same judgment (1 Co 1:10).
Be angry and do not sin; do not let the sun go down on your anger (Eph 4:26).
Let all bitterness and wrath and anger and clamor and slander be put away from you, along with all malice (Eph 4:31).
But now you must put them all away: anger, wrath, malice, slander, and obscene talk from your mouth (Col 3:8).
2 Timothy 2:24-25
And the Lord’s servant must not be quarrelsome but kind to everyone, able to teach, patiently enduring evil, correcting his opponents with gentleness. God may perhaps grant them repentance leading to a knowledge of the truth (2 Tim 2:24-25).