'Mercy seat' in the Bible

And he said unto Moses, "Speak unto Aaron thy brother that he go not at all times into the holy place, that is within the veil that hangeth before the mercy seat which is upon the ark; that he die not. For I will appear in a cloud upon the mercy seat.

and put the cense upon the fire before the LORD: that the cloud of the cense may cover the mercy seat that is upon the witness, that he die not.

And he shall take of the blood of the ox and sprinkle it with his finger before the mercy seat eastward: even seven times.

Then shall he kill the goat that is the people's sin offering, and bring his blood within the veil, and do with his blood as he did with the blood of the ox, and let him sprinkle it toward the mercy seat, and before the mercy seat: