Cross reference
Exodus 39:35
35 The ark of the testimony, and the staves thereof, and the mercy seat,
Exodus 25:17
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
5 And over it the cherubims of glory shadowing the mercyseat; of which we cannot now speak particularly.
Hebrews 9:8
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: