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Mercy-seat

Hebrew: kapporeth, a “covering;” LXX [Septuagint] and New Testament: hilasterion; Vulgate: propitiatorium

the covering or lid of the ark of the covenant (q.v.)

It was of acacia wood, overlaid with gold, or perhaps rather a plate of solid gold, 2½ cubits long and 1½ broad (Ex. 25:17; 30:6; 31:7). It is compared to the throne of grace (Hebrews 9:5; Eph. 2:6). The Holy of Holies is called the “place of the mercy-seat” (1 Chr. 28:11; Lev. 16:2).

It has been conjectured that the censer (thumiaterion, meaning “anything having regard to or employed in the burning of incense”) mentioned in Hebrews 9:4 was the “mercy-seat,” at which the incense was burned by the high priest on the great day of atonement, and upon or toward which the blood of the goat was sprinkled (Lev. 16:11-16; compare Num. 7:89 and Ex. 25:22).