The Lord is gracious, and full of compassion; slow to anger, and of great mercy. Psalms 145:8
...a God ready to pardon, gracious and merciful, slow to anger, and of great kindness... Nehemiah 9:17
Wherefore, my beloved brethren, let every man be swift to hear, slow to speak, slow to wrath: For the wrath of man worketh not the righteousness of God. James 1:19,20
Be not hasty in thy spirit to be angry: for anger resteth in the bosom of fools. Ecclesiastes 7:9
He that is soon angry dealeth foolishly... Proverbs 14:17
He that is slow to anger is better than the mighty; and he that ruleth his spirit than he that taketh a city. Proverbs 16:32