God’s people respond to God’s promised deliverance with praise and thanks.
This collection of songs of praise closes the first part of the book, not unlike the doxologies that close the first four books of the PsalterThe psalter is a volume containing the book of Psalms (see Psalm). In the early Middle Ages psalters were popular and contained - in addition to the psalms - calendars, litanies of saints, and other devotional texts. More (Psalms 41:13; 72:18-19; 89:52: 106:48).
“For the LORD GOD is my strength and my might; he has become my salvation” repeats Moses’ song of victory after the exodus (Exodus 15:2), just one of many places where IsaiahIsaiah, son of Amoz, who prophesied in Jerusalem, is included among the prophets of the eighth century B.C.E. (along with Amos, Hosea, and Micah)--preachers who boldly proclaimed God's word of judgment against the economic, social, and religious disorders of their time. More calls upon the exodus tradition to speak of God’s new work of deliverance in his day.