There shall be no new god in thee: neither shalt thou adore a strange god.

“For if there be error in you, You will not worship a strange god. If you think not of a false god, you will not worship a manufactured god: for "there will not" be in you any strange god. "For I am." Why would you adore what is not? "For I am the Lord your God" [Psalm 81:10]. Because "I am I that Am," and indeed "I Am" He says, I that Am, over every creature: yet to you what good have I afforded in time? "Who brought you out of the land of Egypt." Not to that people alone is it said. For we all were brought out of the land of Egypt, we have all passed through the Red Sea; our enemies pursuing us have perished in the water. Let us not be ungrateful to our God; let us not forget God that abides, and fabricate in ourselves a new god. "I, who led you out of the land of Egypt," says God. "Open wide your mouth, and I will fill it." You suffer straitness in yourself because of the new god set up in your heart; break the vain image, cast down from your conscience the feigned idol: "open wide your mouth," in confessing, in loving: "and I will fill it," because with me is the fountain of life.”

“I am the Lord thy God,.... The true Jehovah, the Being of beings, in whom all live and move and have their beings, the covenant God of his people; and is a reason why they should hear him, and worship him, and no other: which brought thee out of the land of Egypt; this, with what goes before, is the preface to the ten commands, the first and principal of which is urged in the preceding verse; and this is another reason why the Lord God should be had and worshipped, and not a strange god; and redemption from worse than Egyptian bondage, from the bondage of sin, Satan, and the law, and a deliverance from worse than Egyptian darkness, and from a state of wickedness and impiety, should lay under greater obligations still to serve the Lord, and worship him only; who adds, as a further reason for it, open thy mouth wide, and I will fill it; which may be understood of opening the mouth either in prayer or in praise: to open the mouth wide in prayer is to pray with great freedom, to pour out the soul to God, lay open its whole case, and tell him all his mind and wants; to pray with great boldness, and with much importunity and fervency, and in full assurance of faith, pleading with great strength the promises of God, and asking in faith for much, according to them; and God may be said to fill this wide mouth of faith in prayer, when he grants the desires of the heart, gives his people what they will, even very largely and abundantly, yea, more than they can ask or think: to open the mouth wide in praise is to be abundantly thankful for mercies received; and when persons are so, the Lord fills them with more abundant matter for praise and thanksgiving; see Psa 71:8, or this may be interpreted of opening the mouth wide in expressions of desire after spiritual food, hungering and thirsting after spiritual things, when the Lord fills or satisfies the mouths of his people with good things, Psa 103:5, with the sincere milk of the word which they desire, and with the ordinances, the breasts of consolation they long for, and so satisfies them with the goodness and fatness of his house, Psa 64:4, the metaphor seems to be taken from the young of birds, which open their mouths, and are filled by the old ones: the Targum is, "open thy mouth to the words of the law, and I will fill it with every good thing.''”