6:9
وَلَوْ جَعَلْنَـٰهُ مَلَكًا لَّجَعَلْنَـٰهُ رَجُلًا وَلَلَبَسْنَا عَلَيْهِم مَّا يَلْبِسُونَ
walaw jaʿalnāhu malakan lajaʿalnāhu rajulan walalabasnā ʿalayhim mā yalbisūna
Indeed, if We had sent an angel as messenger, We would still have sent him in the form of a man, so increasing their confusion.
And had We appointed him an angel, We indeed would have made him a man, and We would have certainly confused them in which they are already confused (i.e. the Message of Prophet Muhammad صلى الله عليه وسلم).