The Command to be Patient with the Harms of the Disbelievers and a Discussion of what They will rece
Allah commands His Messenger to be patient with what the foolish who reject him among his people say. Allah also commands him to keep away from them in a nice way. This means in a way that is not blameworthy. Then Allah says to him, as a threat and a warning to his people - and He (Allah) is the Most Great, Whose anger nothing can stand before,
وَذَرْنِى وَالْمُكَذِّبِينَ أُوْلِى النَّعْمَةِ
(And leave Me alone to deal with the deniers, those who are in possession of good things of life.) meaning, `leave Me to deal with the rich rejectors, who own great wealth.' For verily, they are more able to obey than others besides them, and they are requested to give the rights (to people) because they have what others do not have.
The verse says in conclusion: وَّعَذَابًا اَلِـــيْمًا (...and a
painful punishment... 73:13).
Having described specific forms of punishment, this description is general - indicating that there will be many more horrible and terrible forms of punishment which man cannot even imagine. [ 0 Allah, save us from all forms of punishment!]
The Righteous Elders' Fear of the Hereafter
Imam Alhmad, Ibn Abi Dawud, Ibn ` Adiyy and Baihaqi record a narration that a person heard this verse and fell fainted. One day Hasan al-Basri (رح) تعالیٰ was fasting. When the food was brought to him at the time of iftar (ending the fast), this verse occurred in his mind and he could not eat. As a result, he sent it away. The following day he was fasting again. The same thing happened in the evening and he sent the food away. On the third day the same thing happened. So, his sons went to Thabit Bunani, Yazid Dabb, and Yahya Al-Bakka' and recounted the story. All three personalities went to Hasan and insisted on his eating something. At their insistence, the latter ate a little. [ Ruh-u1-Ma’ ani ]
Tazkirul Quran
Maulana Wahiduddin KhanOn ayahs 5–13
Literally ‘weighty words’ refers to that order for giving warning which is mentioned in the next chapter, ‘Arise and give warning’ ( 74:2 ). This means inform people about the hazards of the Hereafter. Undoubtedly this is the most difficult task in the world. For this, the missionary has to stand by the pure and unadulterated Truth, even if he becomes a stranger to all his people. He has to tolerate being tormented by the people, so that the relationship between him and his addressees remains unaffected till the last moment. He has to be unilaterally governed by the principles of patience and avoidance of confrontation, so that his status as da‘i should not be damaged.
Uthmani text of the Madinah mushaf (King Fahd Complex). Translation: Saheeh International. Tafsir via Quran.com.