Hebrews 9:3-5

Then there was a curtain, and behind the curtain was the second room called the Most Holy Place. In that room were a gold incense altar and a wooden chest called the Ark of the Covenant, which was covered with gold on all sides. Inside the Ark were a gold jar containing manna, Aaron’s staff that sprouted leaves, and the stone tablets of the covenant. Above the Ark were the cherubim of divine glory, whose wings stretched out over the Ark’s cover, the place of atonement. But we cannot explain these things in detail now.