Anger is not a sin

Anger is a positive virtue when it is directed against what is wrong and sinful.
Examples of Jesus anger.

The Pharisees hypocrisy Mark 3:5
The money changers in the temple.

Other examples Psalm 69:9
Psalm 7:11

Anger is a divine attribute.
The Bible is the book of Gods wrath Naham 1:6

We must not be bad tempered and irritable Galatians 5.
Not easily provoked 1 Corinthians 13:5
James 1:19