Be angry, and sin not: let not the sun go down upon your wrath: Neither give place to the devil.
AIRAOS, PERO NO PEQUEIS; no se ponga el sol sobre vuestro enojo, ni deis oportunidad al diablo.
The Bible has never said that being angry is a sin. How we deal with our anger can be sin though. I think many people have this confused. Jesus even showed anger when He turned the money changers tables over in the temple. If we let the Holy Spirit do the guidance, He will show us how to properly handle our anger. It is ok to be angry, but don’t go to sleep at night boiling in anger. Pray on it and let God show you how to handle that anger.