Where is the first mention of God's wrath in His dealings with mankind?
The first mention of God's wrath in His dealings with mankind is found in Psalms chapter 2. The context indicates that prior judgments, such as the flood and Israel's discipline, were not God's wrath but disciplinary. Psalm 2 speaks of the nations rejecting the Anointed One, and then God addressing them in His wrath rather than grace or love.
Les explains that although God destroyed the human race in the flood and dealt with Israel in strenuous ways, those acts were not His wrath but disciplinary. He points to Psalms chapter 2 as just about the first time the word "wrath" is used with regard to God dealing with mankind. In Psalm 2, the early verses describe Jew and Gentile rejecting the Anointed One, which speaks of crucifying Him. Then verse 4 shows God in the heavens laughing and holding the nations in derision. After repeated rejection and complete confusion, God speaks to them in His wrath, not in grace or love. Les notes that the world does not yet know what the wrath of God is, and this psalm outlines prophecy concerning Israel in simplified form.