Revelation of John 9:1-2

1And the fifth angel blew his trumpet, and aI saw a star fallen from heaven to earth, and he was given bthe key to the shaft of cthe bottomless pit.
Greek  the abyss; also verses 2, 11
2He opened the shaft of the bottomless pit, and from the shaft erose smoke like the smoke of a great furnace, and fthe sun and the air were darkened with the smoke from the shaft.

Revelation of John 9:17-18

17And this is how I saw the horses in my vision and those who rode them: they wore breastplates the color of fire and of sapphire
Greek hyacinth
and of sulfur, and the heads of the horses were hlike lionsheads, and fire and smoke and sulfur came out of their mouths.
18By these three plagues a third of mankind was killed, by the fire and smoke and sulfur coming out of their mouths.
Copyright information for ESV