﴿ وَلَوْ جَعَلْنَٰهُ مَلَكًۭا لَّجَعَلْنَٰهُ رَجُلًۭا وَلَلَبَسْنَا عَلَيْهِم مَّا يَلْبِسُونَ ﴾

“And (even] if We had appointed an angel as Our message-bearer, We would certainly have made him [appear as] a man - and thus We would only have confused them in the same way as they are now confusing themselves.”

Please check ayah 6:11 for complete tafsir.