This psalm recalls two events from Israel's history: the Exodus from Egypt and the entrance into the Promised Land. It uses poetic language to describe how God delivered Israel from Egypt through dividing the Red Sea and providing water from a rock, and how he later parted the Jordan River to allow Israel to cross into the Promised Land. The psalm calls on the earth to tremble before God in recognition of his mighty acts of deliverance and provision for his people. It highlights God's purpose for Israel to be a holy nation set apart for him.