I. The provision that God made to prevent their falling into idolatry. This we have, v. 4. God did what was fit to be done to keep them close to himself; what could have been done more? 1. He made known himself to them as the Lord their God, and took them to be his people in a peculiar manner. Both by his word and by his works all along from the land of Egypt he declared, I am the Lord thy God; he told them so from heaven at Mount Sinai, that he was the Lord and their God, who brought them out of the land of Egypt. This he continued both to declare and to prove to them by his prophets and by his providences. 2. He gave them a law forbidding them to worship any other: "Thou shalt know no God but me; not only shalt not own and worship any other, but shalt not acquaint thyself with any other, nor make the rites and usages of the Gentiles familiar to thee." Note, It is a happy ignorance not to know that which we ought not to meddle with. We find those commended who have not known the depths of Satan. 3. He gave them a good reason for it: There is no saviour besides me. Whatever we take for our God we expect to have for our saviour, to make us happy here and hereafter; as, where we have protection, we owe allegiance, so where we have salvation, and hope for it, we owe adoration.