This is the second psalm in the Hallel. And is pre-eminently a song of His might, as it sings of His might, it sings of it as manifested in mercy. It is the song of the Exodus, and is full of beauty.
The first movement declares that the people passing out of Egypt, did so as the result of the presence of God. Among them was His sanctuary, and they were His dominion. Nature recognised His presence and obeyed His will. The sea fled, Jordan was driven back. This song includes the whole deliverance, the going out under Moses through the sea, and the going in under Joshua through Jordan.