Ephesians 4:26 "Be ye angry, and sin not: let not the sun go down upon your wrath".
To be angry at something is not a sin according to Ephesians 4:26 but, using anger as an excuse to hurt, abuse, kill, ridicule, destroy, spoil, embarrass and become wicked is a sin. Are you an angry fellow? How do you guide against going beyond the limit during the time of your anger? Remember, be angry but, do not sin.