'Mercy seat' in the Bible

And the LORD said to Moses, Speak to Aaron thy brother, that he come not at all times into the holy place within the vail, before the mercy-seat, which is upon the ark; that he may not die: for I will appear in the cloud upon the mercy-seat.

And he shall put the incense upon the fire before the LORD, that the cloud of the incense may cover the mercy-seat that is upon the testimony, that he may not die.

And he shall take of the blood of the bullock, and sprinkle it with his finger upon the mercy-seat eastward: and before the mercy-seat shall he sprinkle of the blood with his finger seven times.

Then shall he kill the goat of the sin-offering that is for the people, and bring his blood within the vail, and do with that blood as he did with the blood of the bullock, and sprinkle it upon the mercy-seat, and before the mercy-seat: