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“An ancient tradition declares: ‘The world to come is characterized by the kind of holiness possessed by the Sabbath in this world … The Sabbath possesses a holiness like that of the world to come.'”
Mekilta to Exodus, 31:17, quoted in Abraham Joshua Heschel, The Sabbath (New York: Farrar, Straus & Giroux, 2005), 73.