Exodus 39:35

the ark of the testimony, and its staves, and the mercy-seat,

Exodus 25:17

And you shall make a mercy-seat of pure gold. Two and a half cubits shall be the length of it, and a cubit and a half the breadth of it.

Hebrews 9:5

And over it were the cherubs of glory overshadowing the mercy-seat (about which we cannot now speak piece by piece.

Hebrews 9:8

the Holy Spirit signifying by this that the way into the Holiest of all was not yet made manifest while the first tabernacle was still standing.

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 shall make a mercy-seat of pure gold. Two and a half cubits shall be the length of it, and a cubit and a half the breadth of it.
Hebrews 9:5
And over it were the cherubs of glory overshadowing the mercy-seat (about which we cannot now speak piece by piece.