'Mercy seat' in the Bible

whom God displayed publicly [before the eyes of the world] as a [life-giving] sacrifice of atonement and reconciliation (propitiation) by His blood [to be received] through faith. This was to demonstrate His righteousness [which demands punishment for sin], because in His forbearance [His deliberate restraint] He passed over the sins previously committed [before Jesus’ crucifixion].

and above the ark were the [golden] cherubim of glory overshadowing the mercy seat; but we cannot now go into detail about these things.