The psalm begins with the departure: when Israel went out from Egypt, the house of Jacob from a people of strange language. Then Judah became his sanctuary, Israel his dominion. God did not only bring his people out but dwelt among them and reigned over them.
Verses 3 and 4 present nature reacting. The sea looked and fled, the Jordan turned back. The mountains skipped like rams, the hills like lambs. This recalls the parting of the Red Sea (Exodus 14) and the crossing of the Jordan on entering Canaan (Joshua 3), which form the two ends of the exodus and the entry into the land.
In verses 5 and 6 the poet addresses the waters and the mountains with questions: what ails you, O sea, that you flee? O Jordan, that you turn back? O mountains, why do you skip like rams? The answer comes in verses 7 and 8: tremble, O earth, at the presence of the Lord, at the presence of the God of Jacob, who turns the rock into a pool of water, the flint into a spring of water.