Midrash Tanchuma Buber
(Exod. 31:18, cont.:) THE TWO TABLETS OF THE TESTIMONY correspond to heaven and earth, to groom and bride, to the two wedding attendants, to this world and the world to come.35Tanh., Exod. 9:16; ibid., Deut. 3:10; Deut. R. 3:16. Ergo: THE TWO TABLETS OF THE TESTIMONY.