Exodus 37:6
And he made the mercy seat of pure gold: two cubits and a half was the length thereof, and one cubit and a half the breadth thereof.
Cross-reference
Exodus 25:17-22 commanded the mercy seat's design; here Bezalel makes it exactly as instructed.
Exodus 40:20 records the placement of this same mercy seat on the ark, completing the construction sequence.
In Leviticus 16:12-15, the mercy seat is where atoning blood is sprinkled on the Day of Atonement, revealing its purpose.
Romans 3:25 uses the same Greek word (hilasterion) for Christ as propitiation, linking the mercy seat to Christ's atonement.
Hebrews 9:5 explicitly mentions the mercy seat overshadowed by cherubim, echoing the construction in Exodus 37:6.
1 John 2:2 calls Christ the propitiation for sins, using a word (hilasmos) related to the mercy seat, linking OT atonement to Christ.
2 Chronicles 5:7 shows the ark with its mercy seat being placed in Solomon's temple — a later use of the same sacred object.