Exodus 39:35

The ark of the law, with its rods and its cover;

Exodus 25:17

And you are to make a cover of the best gold, two and a half cubits long and a cubit and a half wide.

Hebrews 9:5

And over it were the winged ones of glory with their wings covering the mercy-seat; about which it is not possible now to say anything in detail.

Hebrews 9:8

The Holy Spirit witnessing by this that the way into the holy place had not at that time been made open, while the first Tent was still in being;

Treasury of Scripture Knowledge

Summary

The ark of the testimony, and the staves thereof, and the mercy seat,

The mercy seat

Bible References

The mercy seat

Exodus 25:17
And you are to make a cover of the best gold, two and a half cubits long and a cubit and a half wide.
Hebrews 9:5
And over it were the winged ones of glory with their wings covering the mercy-seat; about which it is not possible now to say anything in detail.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain