Deuteronomy 7:21 - Hawker's Poor Man's Commentary

Do not overlook the frequency of the expression, neither the vast and infinite importance of it; for it is the foundation of every other comfort, wherein JEHOVAH calls himself by that distinguishing character, the LORD thy GOD. In this glorious covenant relationship, the LORD makes over, as it were, himself, with all his perfections, as engaged for the salvation of his people. All are pledged for the assurance of the faithful. And it should seem, if one might be allowed to say so, from the many other collateral testimonies of scripture, as if in nothing was the LORD more jealous of his honour, than when men question, or even doubt, his word and truth in this particular. He that believeth not GOD, hath made him a liar. 1 John 5:10.