Revelation 1:15; Revelation 9:2

Revelation 1:15

15 And his feet like unto fine brass, as if they burned in a furnace; and his voice as the sound of many waters.

Revelation 9:2

2 And he opened the bottomless pit; and there arose a smoke out of the pit, as the smoke of a great furnace; and the sun and the air were darkened by reason of the smoke of the pit.