“This is one of the stories of the unseen which We reveal to you [O Prophet]. Neither you nor your people knew it before this”
Cited (with Yusuf 12:102 and Al-Ankabut 29:48) to rebut a narrower objection -- that an unlettered 11-year-old could not have absorbed such detail -- rather than to vouch for the Buhayra account itself, which the lecture treats with real skepticism.