'Mercy seat' in the Bible

The LORD told Moses, "Remind your brother Aaron that at no time is he to enter the sacred place from the room that contains the curtain into the presence of the Mercy Seat on top of the ark. Otherwise, he'll die, because I will appear in a cloud at the Mercy Seat.

"Then he is to place the incense over the fire in the LORD's presence, ensuring that the smoke from the incense covers the Mercy Seat, according to regulation, so he won't die.

He is to take blood from the ox and sprinkle it with his forefinger toward the surface of the Mercy Seat. Then he is to sprinkle the blood on the surface of the Mercy Seat with his forefinger seven times.

"He is to slaughter the male goat as a sin offering for the people and bring its blood beyond the curtain and do with its blood as he did with the blood of the bull: He is to sprinkle it on the Mercy Seat that is, over the surface of the Mercy Seat.