Surat Al-'An`ām - سورة الأنعام

وَلَوْ جَعَلْنَاهُ مَلَكًا لَّجَعَلْنَاهُ رَجُلًا وَلَلَبَسْنَا عَلَيْهِم مَّا يَلْبِسُونَ

Muhsin Khan: And had We appointed him an angel, We indeed would have made him a man, and We would have certainly caused them confusion in a matter which they have already covered with confusion (i.e. the Message of Prophet Muhammad SAW).