What does Psalm 7:13 mean?

A portrayal of God as a mighty warrior continues here. He is depicted as having deadly weapons ready (Psalm 7:12). His arrows are fiery shafts. In His relationship with unrepentant sinners, God is a wrathful avenger (John 3:36). David celebrates this as he asks God to bring judgment (Psalm 7:6–9) on those who have assaulted and slandered him (Psalm 7:1–5). Rather than seeking revenge, David trusts in God's timing (Romans 12:19).

Revelation 6:15–17 reports the actions of unrepentant nonbelievers in the tribulation period, when Jesus, the Lamb of God, opens the sixth seal of the seven-sealed scroll. They hide among the rocks of the mountains and pray to the mountains and rocks to fall on them and hide them from the wrath of God and the Lamb. They call out, "The great day of their wrath has come, and who can stand?" (Revelation 6:17). Under the seventh bowl judgment of the tribulation period, we read, "The great city was split into three parts, and the cities of the nations fell, and God remembered Babylon the great, to make her drain the cup of the wine of the fury of his wrath" (Revelation 16:19).