Cross reference
Exodus 25:21
21 And thou shalt put the mercy seat above upon the ark; and in the ark thou shalt put the testimony that I shall give thee.
Exodus 26:34
34 And thou shalt put the mercy seat upon the ark of the testimony in the most holy place.
Exodus 25:16-17
16 And thou shalt put into the ark the testimony which I shall give thee.
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.
Romans 10:4
4 For Christ is the end of the law for righteousness to every one that believeth.