20-25. Behold, I send an Angel before thee, to keep thee in the way—The communication of these laws, made to Moses and by him rehearsed to the people, was concluded by the addition of many animating promises, intermingled with several solemn warnings that lapses into sin and idolatry would not be tolerated or passed with impunity.

     16-22. the Lord said unto Moses, . . . this people will rise up—In this remarkable interview, Moses was distinctly apprised of the infidelity of Israel, their corruptions of the true religion through intercourse with the idolatrous inhabitants of Canaan (Am 5:26), and their chastisements in consequence of those national defections.