وَلَوْ جَعَلْنَاهُ مَلَكًا لَّجَعَلْنَاهُ رَجُلًا وَلَلَبَسْنَا عَلَيْهِم مَّا يَلْبِسُونَ ٩

And if We had made the Messenger an angel, even then We would have made him (the form of) a man, and (even in that case) We would have put them in the same doubt which they are (already) in (i.e., confused over his physical appearance, they would say: ‘He is a human being like us.’) (6:9)