"He who is slow to anger is better than the mighty." (Prov. 16:32)
"A man of quick temper acts foolishly, but a man of discretion is patient." (Prov. 14:17)
"He who is slow to anger has great understanding, but he who has a hasty temper exalts folly." (Prov. 14:29)
"A hot-tempered man stirs up strife, but he who is slow to anger quiets contention." (Prov. 15:18)
And, from the Christian New Testament's Letter of James: "Let every man be quick to hear, slow to speak, slow to anger, for the anger of man does not work the righteousness of God" (James 1:19-20)