(69:40) that this is the speech of an honourable Messenger,

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Here, “a noble Messenger” implies the Prophet Muhammad (peace be upon him) and in( Surah At- Takweer, Ayat 19). the angel Gabriel, the argument being that after describing the Quran as the word of an honorable Messenger, it has been said: It is not the word of a poet nor of a soothsayer, and obviously the disbelievers of Makkah branded the Prophet Muhammad (peace be upon him) and not Gabriel as a poet and soothsayer. On the contrary, in Surah At-Takweer, after describing the Quran as the word of “a noble messenger” it has been said: That Messenger has great power, and has high ranks with the Owner of the Throne: there he is obeyed and held as trustworthy. And Muhammad (peace be upon him) has seen him on the bright horizon. (verses 20-23). Almost the same thing has been stated in (Surah An-Najm, Ayats 5-10) about Gabriel. 

Here, the question arises; In what sense has the Quran been described as the word of Muhammad (peace be upon him) and of Gabriel. The answer is: the people were hearing it being recited by the tongue of the Prophet (peace be upon him) and the Prophet (peace be upon him) by the tongue of Gabriel. Thereupon, in one way it was the word of the Prophet (peace be upon him) and in another way of Gabriel, but a little below it has been explicitly stated: It is indeed a Revelation from the Lord of the worlds, which is being presented before Muhammad (peace be upon him) by the tongue of Gabriel and before the people by the tongue of Muhammad (peace be upon him). The word Messenger itself points to the truth that the word belongs to neither of them but they have presented it as Messengers of the One Who has sent it down.