27. Jehovah is God. Here the prophet establishes what he said formerly, that God, out of compassion to his Church, dissipated the darkness, and introduced the light of his grace, when David mounted the throne, for that was the harbinger of the redemption which was anticipated to be effected in due time by Christ. He also asserts that God was the author of that deliverance, so wonderful and unlooked for, and he declares that, by the result, he plainly showed himself to be truly God. These words, Jehovah himself is a strong God, because he has restored the light of life to us, are tacitly emphatical. For as the faithful, in consequence of the confused state of the Church, were reduced almost to the brink of despair; the ungodly imagined that all this had happened regarding the children of Abraham, by reason of God himself having, as it were, forsaken them. Wherefore he returns to offer up anew his thankful acknowledgments for the divine grace. He commands the faithful to bind the victim to the horns of the altar, because, according to the legal institute, they could not render solemn thanks unto God without sacrifices. As David was a strict observer of the Law, he would not omit the ceremonial observances which God had enjoined. He would, however, always keep his attention steadily fixed on their grand design, and would have recourse to them only as helps to assist him in presenting a spiritual service unto God. Now that the shadowy dispensation has passed away, it remains that we offer unto God our thanksgivings through Christ, who sanctifies them by his own immaculate offering, lest we should be debarred from this exercise of godliness, by the corruptions of our flesh. And that David turned his attention to the praises of God, is abundantly manifest from the following verse, in which he promises that he would celebrate the name of God, because he was his God, and he knew it; that is, he felt from experience that from his hand he might calculate on receiving sure and immediate assistance.