Leviticus 18:5 - Joseph Benson’s Commentary on the Old and New Testaments

He shall live in them Not only happily here, but eternally hereafter. This is added as a powerful argument why they should follow God's commands rather than men's examples, because their life and happiness depended upon it. And though in strictness, and according to the covenant of works, they could not challenge life for so doing, except their obedience was universal, perfect, constant, and perpetual, and therefore no man since the fall could be justified by the law; yet by the covenant of grace this life is promised to all that obey God's commands sincerely. I am the Lord Hebrew, I am Jehovah; that is, I am faithful to keep my covenant, and to fulfil my promises. See on Exodus 6:3. I am the sovereign dispenser of life and death, and therefore they that keep my laws shall live.