Slow To Anger

The LORD passed before him and proclaimed, "The LORD, the LORD, a God merciful and gracious, slow to anger, and abounding in steadfast love and faithfulness, keeping steadfast love for thousands, forgiving iniquity and transgression and sin, but who will by no means clear the guilty, visiting the iniquity of the fathers on the children and the children’s children, to the third and the fourth generation." (Exodus 34:6-7 ESV)

But you, O Lord, are a God merciful and gracious, slow to anger and abounding in steadfast love and faithfulness. (Psalm 86:15 ESV)

The LORD is merciful and gracious, slow to anger, and plenteous in mercy. (Psalm 103:8 KJV)

The LORD is gracious and merciful, slow to anger and abounding in steadfast love. (Psalm 145:8 ESV)

The LORD is slow to anger and great in power, and the LORD will by no means clear the guilty. His way is in whirlwind and storm, and the clouds are the dust of his feet. (Nahum 1:3 ESV)

Many people said that God in the Old Testament is an angry God. Richard Dawkins, in his book "The God Delusion", wrote of God as follows:
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The God of the Old Testament is arguably the most unpleasant character of all fiction: jealous and proud of it; a petty, unjust, unforgiving control-freak; a vindictive, bloodthirsty ethnic cleanser; a misogynistic, homophobic, racist, infanticidal, genocidal, filicidal, pestilential, megalomaniacal, sadomasochistic, capriciously malevolent bully.
UNQUOTE

But God, in His proclamation to Moses, declared Himself to be merciful and gracious. Many other verses in the Old Testament also attest to God as one who is slow to anger.

But God will by no means clear the guilty. That makes Him appeared angry to the guilty, because the wrath of God remains upon them.

But I know my God is slow to anger, otherwise I would have perished long ago.

If thou, LORD, shouldest mark iniquities, O Lord, who shall stand? (Psalm 130:3 KJV)

Enter not into judgment with your servant, for no one living is righteous before you. (Psalm 143:2 ESV)