﴿ يَقُولُ أَءِنَّكَ لَمِنَ ٱلْمُصَدِّقِينَ ﴾

“who was wont to ask [me], ‘Why - art thou really one of those who believe it to be true”

(Who used to say: Art thou in truth of those who put faith (in his words)) do you really believe those messengers?