Anger is not sin but we are warned to not let it lead to sin.
Do not let your anger lead to being 'offended', to hatred, or to un-forgiveness. All those things are bad and lead you away from the Lord, not toward Him.
Scripture quotations marked "NKJV™" are taken from the New King James Version. Copyright © 1982 by Thomas Nelson, Inc. Used by permission. All rights reserved.
Scripture quotations marked (NLT) are taken from the Holy Bible, New Living Translation, copyright © 1996. Used by permission of Tyndale House Publishers, Inc., Wheaton, Illinois 60189. All rights reserved.