The Punishment of the Disbelievers and Liars, and the Reward of the Sincere Believers
The idolators uttered lies against Allah and said that there were other gods besides Him and claimed that the angels were the daughters of Allah and that Allah had a son -- glorified be He far above all that they say. Moreover, they rejected the truth when it came to them on the lips of the Messengers (peace and blessings be upon them all). Allah says:
(Then, who does more wrong than one who utters a lie against Allah, and denies the truth when it comes to him!) meaning, there is no one who does more wrong than such a person, because he combines the two aspects of falsehood, disbelief in Allah and disbelief in the Messenger of Allah ﷺ. They made false claims and rejected the truth, Allah threatened them:
All deeds will be given against oppressions and infringement of rights, but one's 'iman (faith) will not be given
After having reported all Hadith narrations cited above, it has been said in Tafsir Mazhari that the thing mentioned about giving the deeds of the oppressor in settlement of the rights of the oppressed means deeds other than 'iman (faith). The reason is that all oppressions and injustices are acts of sin. They are not kufr or disbelief. And the punishment of sinful deeds will be limited as against 'iman (faith) which is a limitless deed. Its reward too is limitless, that is, living in Jannah forever - even though, it may happen after having gone through the punishment of sins and staying in Jahannam for a certain period of time. The outcome is, when the good deeds of the oppressor - with the exception of 'iman (faith) - will finish once given to the oppressed to the last deed leaving nothing behind but 'iman, then, this 'iman will not be taken away from him forcibly. Instead, the rights of the oppressed will be paid back by putting the sins of the oppressed in the account of the oppressor. As a result, this person will, after he has undergone the punishment of his sins, will finally enter the Jannah, and then this state of his will be everlasting. The author of Tafsir Mazhari says that Imam al-Baihaqi has also said so.
The Quran’s statements are in a language intelligible to man and within the sphere of his knowledge, so that nobody should have any difficulty in understanding them. Here, in symbolic language, it has been explained that the principle of the Unity of God as compared to polytheism is more rational and consistent with nature. Indeed, the functioning of the external universe is indicative of the fact that a single Will is operative in it. Had there been many intentions operative therein, the system of the universe could not have run so harmoniously. Moreover, man’s nature is also such that it prefers unity in loyalty. It is entirely against man’s nature to subscribe to different kinds of loyalties, as a result of which he is unable to do justice to any of them. All arguments and possibilities indicate that there is only one God, who is the Creator of man and who is worthy of being worshipped by him. In the present world, this fact is proclaimed through men like us. On the Day of Judgement, this will be declared by the Creator of the Universe Himself. At that time, denial of this fact will be impossible.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.