The book of Exodus is bifid in composition, meaning that its material is presented to the reader in two main parts. A first part tells the story of God's rescue of the people of Israel from Egypt and his bringing them to Mount Sinai (chaps. 1–19), and a second part describes his covenant with them, made as they encamped at Mount Sinai (chaps. 20–40). Many possible subdivisions are found within these two major halves of the book (as, indeed, this commentary takes note of), but it is hard to miss the basic division of stories of Israel on their way to Sinai and accounts of God's covenant provision for them (including confirmations of and threats to that covenant relationship) after they are there.1 Exodus may thus be divided into two broad topics: (1) deliverance of a group of people from submission to their oppressors to submission to God and (2) the constitution of that group as a people of God. Put another way, Exodus is about rescue from human bondage and rescue from sin's bondage.2 Yet another way to think of the two parts of the book is through the idea of servitude: in Egypt, Israel was the servant of pharaoh; at Sinai they became God's servants.