﴿ ۞ وَمَا كَانَ لِبَشَرٍ أَن يُكَلِّمَهُ ٱللَّهُ إِلَّا وَحْيًا أَوْ مِن وَرَآئِ حِجَابٍ أَوْ يُرْسِلَ رَسُولًۭا فَيُوحِىَ بِإِذْنِهِۦ مَا يَشَآءُ ۚ إِنَّهُۥ عَلِىٌّ حَكِيمٌۭ ﴾

“And it is not given to mortal man that God should speak unto him otherwise than through sudden inspiration, or [by a voice, as it were,] from behind a veil, or by sending an apostle to reveal, by His leave, whatever He wills [to reveal]: for, verily, He is exalted, wise.”

(And it was not (vouchsafed)) it was not permissible (to any mortal that Allah should speak to him) directly without a veil (unless (it be) by revelation) in dream (or from behind a veil) as when He spoke with Moses (pbuh) (or (that) He sendeth a messenger) i.e. Gabriel, such as when He sent him to the Prophet Muhammad (pbuh) (to reveal what He will) of commands and prohibitions (by His leave) by His command. (Lo! He is Exalted) more exalted than all created beings, (Wise) in His command and decree.