A focused study of the two words in 56:94, showing how the wording conveys not merely fire itself, but the act of being made to undergo scorching exposure within an intensely blazing, unrelenting reality.
The ayah’s wording is not a generic mention of fire. It depicts a state in which someone is caused to undergo scorching contact with a blazing fire.
تَصْلِيَةُ
This word comes from the root صلي and carries root meanings of: exposure to intense heat, being scorched, roasted, and suffering burning.
The word belongs to a semantic field of heat, burning, scorching, and roasting.
The forms صَلَّى and تَصْلِيَةُ imply causing someone to be exposed to fire and made to suffer burning.
The word is used for roasting meat and for shaping a staff by softening it through heat.
جَحِيمٍ
This word is linked to verbs conveying burning, blazing, fierce kindling, and vehemence. Its naming points to a fire whose blaze is severe in nature.
جَهُمَ and جَهِمَ carry meanings of burning, blazing, and being vehement and fiery.
جَحَمَ describes kindling a fire or making it burn fiercely.
The فَعِيل pattern implies something that abides and does not let off.
تَصْلِيَةُ conveys exposure to severe scorching heat and the suffering of burning.
Such exposure occurs by causing someone to enter the fire itself.
Thus وَتَصْلِيَةُ جَحِيم implies causing someone to enter the blazing fire so they are scorched by it.
جَحَّمَ and تَحْجِيم are used for regarding, looking, or staring with fixed eyes. This is linked to the root’s broader sense of burning intensity and vehemence.
Classical lexica record جَحَّمَ as meaning to stare fixedly or intently at something.
This fixed stare grows naturally from the same root idea of intensity, burning, and vehemence.
جَحْمَة is a term for an eye of fierce burning intensity, or one so fixed that it does not blink.
The eyes of predators and lions are described with this word, symbolizing a fixed stare intent upon attacking prey.
Accordingly, the name جَحِيم implies that not only its flame and burning are intense, but everything about it, including sight and sound, is marked by intensity and vehemence.