The question from the questioner is about "Sa'ala Sa'ilun bi 'Adhabin Waqi'in" – who is he?

"A questioner asked concerning a torment about to befall." This means "a caller called for an imminent torment" or "a questioner asked about an torment about to befall." The letter 'ba' (ب) in the verse may be extra or may mean "about." The questioner is An-Nadr ibn Al-Harith, who prayed: "O Allah, if this is indeed the truth from You, then rain down upon us stones from the sky."