(Verily, you are going to taste the painful torment; and you will be requited nothing except for what you used to do.) Then He makes an exception in the case of His sincerely believing servants. This is like the Ayat:
After having described the condition of the people of Jahannam (Hell), the verses cited above have mentioned the condition of the people of Jannah (Paradise). This description is in two parts. The initial ten verses describe the comforts the people of Jannah will be blessed with. After that, the verses that follow take up an event relating to a particular inmate of Jannah which has lessons of guidance. Out of what has been said in the first ten verses, a few things are worth mentioning. These are as follows:
1. It was said in the first verse (41): أُولَـٰئِكَ لَهُمْ رِزْقٌ مَّعْلُومٌ (Those are the people for whom there is a known provision). Commentators explain it variously. (1) Some say that it refers to the detailed description of the provisions of Paradise mentioned in different Surahs of the Qur'an. Maulana Ashraf Thanavi has elected to go by this very Tafsir. (2) Others have said that 'known provision' means that its timings are determined and known, that is, it will be bestowed punctually all mornings and evenings as indicated in another verse بُكْرَةً وَعَشِيًّا 'and for them there is their provision in it, morning and evening' -Maryam, 19:62) where the words: صُبح و شَام (morning and evening) have been explicitly mentioned. (3) Then, there is a third Tafsir as well. According to this explanation, 'known provision' means that this provision will be certain and everlasting - unlike the world of our experience where no one can say with any degree of certainty what and how much of that provision he or she is going to get; nor does anyone know how long his provision will remain available to him or her. Every human heart is all the time under the fear that the blessings he has may disappear in future- may be, comes a tomorrow and they are no more there. Jannah will be free of this danger. Instead, the provision of Paradise will be certain and everlasting, both. (Qurtubi, and others).
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 39–48
When they were told that there was nobody worth worshipping except God, they behaved haughtily. This does not mean that their haughty behaviour was directed against God. The majesty of God is too lofty to allow any individual to be so presumptuous. Their haughty behaviour, in fact, was aimed at His messenger. The leaders in whose name others indulged in polytheistic acts, were adversely affected by the Prophet’s call for belief in the oneness of God. On the one hand was the Prophet and on the other, the polytheistic leaders. Since the Prophet appeared to be of a lesser stature than the leaders, most people ignored him, considering him a person of little or no account. The force of argument was undoubtedly on the side of the Prophet, but apparent greatness seemed to reside in their leaders and history is replete with examples where the force of reason has proved ineffective in the face of apparent greatness.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.