The chariots of God are twice ten thousand, thousands upon thousands; the Lord is among them; Sinai is now in the sanctuary.
David composed this psalm to celebrate victories God granted him over his enemies, most likely after his triumph over the Ammonites and Syrians when the ark returned to Jerusalem. The ark's ascent to the holy mountain prefigures Christ's far more glorious ascension to heaven after He conquered His enemies and ours. Though the psalm rises to great heights of sublimity, its interpretation presents considerable difficulty at many points.
AI summary
Commenting on Psalm 68:1-35
The chariots of God are twenty thousand. Other countries, which in the former verse were symbolically referred to as "high hills, "gloried in their chariots of war; but Zion, though far more lowly, was stronger than they, for the omnipotence of God was to her as two myriads of chariots.
David, having given God praise for what he had done for Israel in general, as the God of Israel (Psa 68:8), here comes to give him praise as Zion's God in a special manner; compare Psa 9:11. Sing praises to the Lord who dwelleth in Zion, for which reason Zion is called the hill of God. I.
Commenting on Psalm 68:15-21