Overall meaning : Allah Almighty warns the People of the Book against overstepping the bounds of truth in their religion and forging lies against Him. He reproves the Christians who have gone beyond the proper limits in their love for and devotion to Jesus so much so as to falsely claim that he is His son, and declares that the Messiah, Jesus son of Mary, is no more than one of His messengers, whom He created by the word whereby He commanded him to come into existence, and which He cast to Mary, as well as one of the spirits He has created, and by no means His son, as they claim. Therefore, He commands, they should believe in Him and all His messengers and not say that He is one of the three persons of the Trinity, stating it will be better for them to desist from making such a monstrous and abominable assertion, which obviously testifies to unbelief, for there is no god but one God—Allah Almighty. Far exalted is He above having a son! Everyone and everything in the heavens and the earth are His creatures, so how can He possibly have a wife or a son from them?! Sufficient is Allah as a disposer of all affairs, and He by no means stands in need of a son to help Him guard His kingdom.
He further explains that Jesus son of Mary, peace be upon him, would never disdain to be a servant of Allah nor would the angels nearest to Him, and points out that those who disdain to worship Him should know that He will bring them all together before Him, on Judgement Day, along with everyone else and repay them all according to their actions. To those who believe and do righteous deeds, He will grant their rewards in full and will give them yet more out of His unbounded bounty; but as for those who are disdainful and arrogant, He will inflict an agonizing punishment on them, and they will find neither a supporter to defend them, nor a helper to save them from His punishment.
Then, addressing all mankind, the Almighty proclaims that conclusive proofs distinguishing truth from falsehood have come to them from Him, and that He has sent down to them the Qur’an—as a manifest light to guide them. He promises those who believe in Him and trust in Him in all their affairs that He will admit them into His mercy, give them yet more out of His immense bounty and show them and guide them to the right path leading to His good pleasure.