تفسير : (this is a warner) i.e. muhammad (pbuh) is a warning messenger (of the warners of old) like the earlier messengers whom we sent to their folks; it is also said that this means: this is a messenger among the messengers of old whom it is written, in the guarded tablet, that we would sent to their folks.
Jalāl al-Dīn al-Maḥallī
تفسير : this, muhammad (s), is a warner, [in the tradition] of the warners of old, of their kind, that is to say, he is a messenger like messengers before him, sent to you just as they were sent to their peoples.