Hebrews 9:3-5

Behind the second veil there was another tabernacle [the inner one or second section] known as the Holy of Holies, [Ex 26:31-33] having the golden altar of incense and the ark of the covenant covered entirely with gold. This contained a golden jar which held the manna, and the rod of Aaron that sprouted, and the [two stone] tablets of the covenant [inscribed with the Ten Commandments]; [Ex 16:32-34; 30:1-6; Num 17:8-10] and above the ark were the [golden] cherubim of glory overshadowing the mercy seat; but we cannot now go into detail about these things.