﴿ وَيَقُولُونَ لَوْلَآ أُنزِلَ عَلَيْهِ ءَايَةٌۭ مِّن رَّبِّهِۦ ۖ فَقُلْ إِنَّمَا ٱلْغَيْبُ لِلَّهِ فَٱنتَظِرُوٓا۟ إِنِّى مَعَكُم مِّنَ ٱلْمُنتَظِرِينَ ﴾

“NOW THEY [who deny the truth] are wont to ask, "Why has no miraculous sign ever been bestowed upon him from on high by his Sustainer?" Say, then: "God's alone is the knowledge of that which. is beyond the reach of human perception. Wait, then, [until His will becomes manifest:] verily, I shall wait with you!"”

(And they will say) i.e. the disbelievers of Mecca: (If only a portent) a sign (were sent down upon him) i.e. to Muhammad (pbuh) (from his Lord!) to vouchsafe his claim. (Then say) O Muhammad: (The Unseen) regarding the sending of such a sign (belongeth to Allah. So wait) for my destruction! (Lo, I am waiting with you) for your destruction.