Hebrews 9:4

This had a censer of gold, and the ark of the Covenant lined with gold and completely covered with gold, and in it were a gold vase which held the manna, and Aaron's rod which budded and the tables of the Covenant.

Revelation 15:8

And the sanctuary was filled with smoke from the glory of God and from His power; and no one could enter the sanctuary till the seven plagues brought by the seven angels were at an end.

Treasury of Scripture Knowledge

Summary

There was nothing in the ark save the two tables of stone, which Moses put there at Horeb, when the LORD made a covenant with the children of Israel, when they came out of the land of Egypt.

In the ark

Bible References

In the ark

Hebrews 9:4
This had a censer of gold, and the ark of the Covenant lined with gold and completely covered with gold, and in it were a gold vase which held the manna, and Aaron's rod which budded and the tables of the Covenant.