the mercy seat
Exodus 25:17
And thou shalt make a mercy seat of pure gold: two cubits and a half shall be the length thereof, and a cubit and a half the breadth thereof.
Hebrews 9:5
And over it the cherubims of glory shadowing the mercyseat; of which we cannot now speak particularly.
Hebrews 9:8
The Holy Ghost this signifying, that the way into the holiest of all was not yet made manifest, while as the first tabernacle was yet standing: