Exodus 34:27-28

He wrote upon the tables.

The second tables

The Ten Commandments were twice written by the finger of God Himself (see Deuteronomy 10:1), and upon enduring tables of stone, to show how deeply and permanently they were to be engraved upon the heart of man. Twice written, once upon a broken and once upon an unbroken tablet, symbolically setting forth the truth that they were once written upon the nature before the Fall, and are to be inscribed a second time upon that nature, which inscription is made at his regeneration. Also, as they were once written upon stone, they were to be engraved a second time upon the heart, as the prophet Jeremiah predicted would be, and as the apostle asserted had been done (Hebrews 8:10). Then by special command they were afterwards deposited for safe keeping in the ark of the covenant, upon which rested the Shekinah of the Lord, the most inviolably sacred place outside the courts of heaven, and by special designation were ever afterward known as the “Tables of the Testimony.” (James Stacy, D. D.)