Al-An'am - 6:9

وَلَوْ جَعَلْنَاهُ مَلَكًا لَّجَعَلْنَاهُ رَجُلاً وَلَلَبَسْنَا عَلَيْهِم مَّا يَلْبِسُونَ
[6:9]
And if We had made him angel, We would certainly have made him a man, and We would certainly have made confused to them what they make confused.
If We had made it an angel, We should have sent him as a man, and We should certainly have caused them confusion in a matter which they have already covered with confusion.
Had we appointed him (Our messenger) an angel, We assuredly had made him (as) a man (that he might speak to men); and (thus) obscured for them (the truth) they (now) obscure.