Fire Of Wrath And Mercy, Leviticus 6-7, OT S1:E78

The priests were told to never let the fire on the altar go out. It symbolized both God's wrath and His mercy. Here we see another earthly representation of the eternal reality in heaven. As Isaiah the prophet would learn in Isaiah chapter six, in heaven, the altar in heaven continually burns as a reminder of God's wrath and mercy.