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 above it cherubim of glory overshadowing the mercy-seat; of which things we cannot now speak severally.
Hebrews 9:8
8 the Holy Spirit this signifying, that the way into the holy place hath not yet been made manifest, while the first tabernacle is yet standing;