Cross reference
Exodus 25:21
21 You shall put the mercy seat on top of the ark, and in the ark you shall put the testimony that I will give you.
Exodus 26:34
34 You shall put the mercy seat on the ark of the testimony in the most holy place.
Exodus 25:16-17
16 You shall put the testimony which I shall give you into the ark.
17 You shall make a mercy seat of pure gold. Two and a half cubits shall be its length, and a cubit and a half its breadth.
Romans 10:4
4 For Christ is the fulfillment{or, completion, or end} of the law for righteousness to everyone who believes.