Overall meaning : Allah Almighty mentions what He has in store for the believers in the hereafter, saying: Such is Paradise that Allah has promised the pious who do what He commands and avoid what He forbids: Rivers flow beneath its trees and palaces. Its food is perpetual, and so is its shade. That will the ultimate outcome and abode of the pious, but the ultimate outcome and abode of unbelievers will be the Fire.
Allah then explains that the People of the Book (the Jews and Christians) have split into two groups regarding the Qur’an: a group that rejoice in its revelation and another group that denies some of it: Those to whom We have given the book from among the Jews and Christians, who have believed in you, Muhammad, rejoice in the Qur’an which Allah has revealed to you, as it agrees with and confirms the truth they have in their own books, while some of those who have rallied against you from the unbelievers among them as well among others deny a part of it. Say to them, Muhammad, ‘Allah has commanded me to worship none but Him. To Him do I invite people to worship Him alone; to Him do I refer all my affairs and to Him shall I return.’
Next, He points out that He has sent His Messenger with the language of his own people just as He has sent messengers before him with the language of their own people: Just as We sent down the books to the previous prophets in their own languages, so, too, We have sent down the Qur’an to you, as a perfect code in the Arabic tongue, to judge between people. And if you were to follow the idolaters’ whims and desires after the truth that has come to you from Allah, you would have none to help you and take charge of your affairs, nor would you find anyone to protect you against Allah’s punishment.