“When Israel went out from Egypt, the house of Jacob from a people of strange language, Judah became his sanctuary, Israel his dominion” (v1-2). When God rescued His people from Egypt, the psalmist said, He demonstrated the power that makes the whole world tremble (v7). The Creator of the universe had mercy on the Israelites, who were slaves in Egypt; He redeemed them and chose to live among them. When God comes to earth, says the psalmist, the sea and mountains are moved.
He “turns the rock into a pool of water” (v8). The same God who rescued Israel and provided water in the desert still rescues, redeems, and miraculously provides for us.