TSK · Exodus 25:17

You are to put the atonement lid on the ark of the testimony in the Most Holy Place.

He made an atonement lid of pure gold; its length was three feet nine inches, and its width was two feet three inches.

and take a censer full of coals of fire from the altar before the LORD and a full double handful of finely ground fragrant incense, and bring them inside the curtain.

God publicly displayed him at his death as the mercy seat accessible through faith. This was to demonstrate his righteousness, because God in his forbearance had passed over the sins previously committed.

And above the ark were the cherubim of glory overshadowing the mercy seat. Now is not the time to speak of these things in detail.