58:13,14 The sabbath is a sign between God and his professing people; his appointing it is a sign of his favour to them; and their observing it is a sign of their obedience to him. We must turn from travelling on that day; from doing our pleasure on that holy day, without the control and restraint of conscience; or from indulging in the pleasures of sense. On sabbath days we must not follow our callings, or our pleasures. In all we say and do, we must put a difference between this day and other days. Even in Old Testament times the sabbath was called the Lord's day, and is fitly called so still; and for a further reason, it is the Lord Christ's day, Re 1:10. If we thus remember the sabbath day to keep it holy, we shall have the comfort and profit of it, and have reason to say, It is good to draw near to God.
14. delight … in … Lord—God rewards in kind, as He punishes in kind. As we "delight" in keeping God's "Sabbath," so God will give us "delight" in Himself (Ge 15:1; Job 22:21-26; Ps 37:4).
ride upon … high places—I will make thee supreme lord of the land; the phrase is taken from a conqueror riding in his chariot, and occupying the hills and fastnesses of a country [Vitringa], (De 32:13; Mic 1:3; Hab 3:19). Judea was a land of hills; the idea thus is, "I will restore thee to thine own land" [Calvin]. The parallel words, "heritage of Jacob," confirm this (Ge 27:28, 29; 28:13-15).
mouth of … Lord … spoken it—a formula to assure men of the fulfilment of any solemn promise which God has made (Isa 40:5).