Mercy-Seat: Placed on the Ark of the Testimony
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Exodus 26:34
Put the mercy seat on the ark of the Testimony in the Most Holy Place.
Exodus 30:6
Place the altar in front of the veil that is before the ark of the Testimony—before the mercy seat that is over the Testimony—where I will meet with you.
Exodus 31:7
the Tent of Meeting, the ark of the Testimony and the mercy seat upon it, and all the other furnishings of the tent—
Exodus 40:20
Moses took the Testimony and placed it in the ark, attaching the poles to the ark; and he set the mercy seat atop the ark.
Hebrews 9:5
Above the ark were the cherubim of glory, overshadowing the mercy seat. But we cannot discuss these things in detail now.