"It is not given to any human being that Allah should speak to him, except by revelation or from behind a veil" (Q. 42:51), and Musa was among those whom Allah spoke to from behind a veil. "Or that He sends a messenger" (Jibril) "to reveal by His permission what He wills."
Muhammad said: It is said: "Except by revelation" (illa wahyan), meaning: through inspiration. It is read as "aw yursila" (or He sends) and "aw yursulu" (or He sends) in both the accusative and nominative cases. As for whoever reads it in the accusative, the meaning is: It is not for a human being that Allah should speak to him except by Him revealing or by Him sending. And whoever reads it in the nominative, the meaning is: or He (Himself) sends.
﴿وَمَا كَانَ لِبَشَرٍ أَن يُكَلِّمَهُ اللَّهُ إِلَا وَحْيًا أَوْ مِن وَرَاء حِجَابٍ﴾ فَكَانَ مُوسَى مِمَّن كَلمه الله وَرَاءِ حِجَابٍ ﴿أَوْ يُرْسِلَ رَسُولاً﴾ ﴿جِبْرِيل﴾ (فَيُوحِيَ بِإِذْنِهِ مَا يَشَاء﴾.
قَالَ محمدٌ: قيل: ﴿إِلا وَحْيًا﴾ يَعْنِي: إلهامًا , وتقرأ: ﴿أَو يرسلُ﴾ بِالرَّفْع وَالنّصب؛ فَمن قَرَأَهَا بِالنّصب فَالْمَعْنى: مَا كَانَ لبشر أَن يكلمهُ الله إِلَّا بِأَن يوحي أَو أَن يُرْسل، وَمن قَرَأَ بِالرَّفْع فَالْمَعْنى: أَو هُوَ يرسلُ.
