Then shalt thou delight thyself in the LORD; and I will cause thee to ride upon the high places of the earth, and feed thee with the heritage of Jacob thy father: for the mouth of the LORD hath spoken it.
Great stress was always laid upon the due observance of the sabbath day, and it was particularly required from the Jews when they were captives in Babylon, because by keeping that day, in honour of the Creator, they distinguished themselves from the worshippers of the gods that have not made the heavens and the earth.
Commenting on Isaiah 58:13-14
Then shalt thou delight thyself in the Lord,.... In his perfections; in his omnipotence, omniscience, omnipresence, eternity, immutability, holiness, justice, truth, and faithfulness; in his wisdom, love, grace, and mercy, especially as displayed in Christ, and salvation by him; in the relations he stands in to his people, as their covenant God and Father, and in what he is to them, their shield and exceeding...
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 (Gen 15:1; Job 22:21-26; Psa 37:4). ride upon . . .