'Tablets' in the Bible

It is clear that you are Christ’s letter, produced by us, not written with ink but with the Spirit of the living God—not on stone tablets but on tablets that are hearts of flesh.

But if the ministry that produced death -- carved in letters on stone tablets -- came with glory, so that the Israelites could not keep their eyes fixed on the face of Moses because of the glory of his face (a glory which was made ineffective),