Verš 102:6

a věru oheň planoucí uzříte

Tafsir al-Jalalayn

you would surely see hell-fire, the Fire (la-tarawunna’l-jahīma: this is the response to an omitted oath; the third consonant of the root of the verb [r-’-y] together with the second have been omitted, and its vowel has been transposed onto the rā’).