Or [why is not] a treasure presented to him [from heaven], or does he [not] have a garden from which he eats?" And the wrongdoers say, "You follow not but a man affected by magic."
What the Disbelievers said about the Messenger , refutation of Their Words, and Their ultimate Destiny
Allah tells us about the disbelievers' stubborn resistance to and rejection of the truth, with no proof or evidence for doing so. Their excuse was, as they said:
مَا لِهَـذَا الرَّسُولِ يَأْكُلُ الطَّعَامَ
(Why does this Messenger eat food,) meaning, `as we eat, and why does he need food as we need it'
وَيَمْشِى فِى الاٌّسْوَاقِ
(and walk about in the markets.) means, he walks around and goes there often seeking to trade and earn a living.
(Why is not an angel sent down to him to be a warner with him) They were saying: why doesn't an angel come down to him from Allah, to be a witness that what he is claiming is true This is like when Fira`wn said:
From this point onward the objections raised by infidels and polytheists against the Holy Qur'an and the prophethood of the Holy Prophet ﷺ are related together with the answers to those objections.
The first objection was that the Qur'an was not a revealed book from Allah Ta’ ala, but has been compiled from the old stories and narrations by the Jews and Christians which have been reduced into writing by the Companions of the Holy Prophet ﷺ ، since he himself was illiterate and could not write. And because he could not read or write, he would get them read out to him day and night, so that he could remember them by heart, then he would repeat them before people and claim that he had received that revelation from Allah Ta’ ala.
Those who denied the truth used to denigrate the Quran as a false testament, but in fact the target of their allegation was the Prophet Muhammad. The Prophet appeared to them as an ordinary man. They were unable to understand how an ordinary man could be the possessor of an extraordinary Book. The Quran touches upon various topics of a historical, psychological and social nature, etc., but no factual error has ever been pointed out in it. This proves that the Quran was authored by a Being who is aware of the secrets of the universe to the fullest extent. Had it not been so, the Quran also would have been full of mistakes—as are found in other man-made books. This fact in itself is the greatest argument in favour of the Quran being a Book of God. Those who make baseless statements against the Quran, are indulging in undue bravado. Such people will definitely be seized upon by God. However, if they come back to the right path, it is not God’s way to take revenge after their repentance. God looks at the individual’s present and not his past.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.