وَإِذَا الجَحيمُ سُعِّرَت

When hell is set ablaze.

EXEGESIS

The passive perfect tense verb suʿʿirat means to be inflamed, and to be set alight.^{‎[1]Arabic-English Dictionary of Qur’ānic Usage, p. 437.} The verbal noun of this verb is tasʿīr, which means the kindling of fire till it burns.^{‎[2]Mizan, 20/215.}

[1] Arabic-English Dictionary of Qur’ānic Usage, p. 437.
[2] Mizan, 20/215.