'Tablets' in the Bible

revealing that you are a letter of Christ, delivered by us, written not with ink but by the Spirit of the living God, not on stone tablets but on tablets of human hearts.

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),

It contained the golden altar of incense and the ark of the covenant covered entirely with gold. In this ark were the golden urn containing the manna, Aaron's rod that budded, and the stone tablets of the covenant.