The meaning of Anger in the Bible
(From Easton's Bible Dictionary)

the emotion of instant displeasure on account of something evil that presents itself to our view. In itself it is an original susceptibility of our nature, just as love is, and is not necessarily sinful. It may, however, become sinful when causeless, or excessive, or protracted (Matthew 5:22; Ephesians 4:26; Colossians 3:8). As ascribed to God, it merely denotes his displeasure with sin and with sinners (Psalms 7:11).

See more on the meaning of Anger in the Bible:
Anger {International Standard Bible Encyclopedia}

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