That this is indeed the word of the noble Messenger,
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : (that it) i.e. the qur'an (is indeed the speech of an illustrious messenger) he says: the qur'an is the word of allah which gabriel brought down to an illustrious messenger, i.e. muhammad (pbuh).
Jalāl al-Dīn al-Maḥallī
تفسير : it, that is to say, the qur’ān, is indeed the speech of a noble messenger, in other words, he has spoken it as a message from god, exalted be he.