Ephesians 4:26 King James Version (KJV) 

Be ye angry, and sin not: let not the sun go down upon your wrath:”
https://www.biblegateway.com

Vent

“Forceful expression or release of pent-up thoughts or feelings: give vent to one’s anger.”

http://www.thefreedictionary.com/vent

Venting your feelings in a healthy way

“It is healthy to allow ourselves to step outside of our nice postures and exhibit the not-so-nice side of our personalities now and again. Having a sympathetic ear and soft shoulder to lean can be wonderfully reassuring. It is especially nice to have someone who will validate our right to feel the way we do. We can return the favor when it becomes their turn to vent something from the darker sides of their natures. Having an outlet for venting the emotional stuff can be a good thing, repressing resentments… not so good.”

Desy, Phylamenana lila, March 11, 2015, http://healing.about.com/od/emotion/a/venting-your-rage.htm