sulfur: the yellow mineral that catches fire easily and burns with a choking smell, named in the New Testament only where something is being destroyed in judgment
Sulfur is an ordinary mineral, and the New Testament treats it as one. It crusts the ground in the tar country around the Dead Sea, it lights from almost nothing, it burns with a pale flame, and the smell it leaves behind hangs in the air. The word turns up seven times, and every single time fire (πῦρ) is standing next to it. This word never appears on its own.
Those seven verses fall into three scenes:
- the day sulfur rained out of the sky on Sodom, recalled as a warning about the day the Son of Man is revealed
- the plague pouring from the mouths of the horses in a vision, killing a third of the human race
- the lake that goes on burning with it, where the beast, the false prophet, the devil, and the condemned are thrown
Why name the sulfur at all, when the fire is already named? Because fire alone says only that something is burning. Sulfur says how it burns: hard to start away from, harder to put out, and impossible to be near without knowing it. In a lake that burns with fire and sulfur, the mineral is the reason the burning does not stop.
One verse shows the whole word family at once. In Revelation 9:17 the riders wear breastplates described with the matching adjective (θειώδης), meaning sulfur-yellow, and then the sulfur itself comes out of the horses' mouths. Behind all seven verses stands Genesis 19, where the Hebrew word for this same mineral (גָּפְרִית) falls on Sodom. Every New Testament use is reading off that page.