And when these oaths were completed, encompassing great matters, indicating that their causes from the winds and waters were with the people while they did not perceive them, just as it may be that the Day of Resurrection is likewise, equally so. He means by saying, mentioning the one he swears by, confirming for the sake of their denial: "Indeed, what you are promised" [i.e., of punishment in this world and the Hereafter, and of the Day of Resurrection, and of glad tidings for the people of obedience]. He established it for the effect because it is what is feared, not because it is from a specific thing, while it is known that it is from what Allah has threatened by the tongue of Muhammad, blessings and peace be upon him. "It is surely going to happen" [i.e., it is certain to occur, and its causes are ready with you, even if you do not see them, just as in these things by which He swore and what has not been affected by them.

And Imam Abu Ja'far ibn al-Zubayr said: Allah, the Exalted, swore by the angels who are continuously sent, and by the winds that are made subservient, and by His authority over the rain, and by the angels who distinguish between truth and falsehood, and by those who convey the reminder through revelation to the prophets as a warning from Allah and a notification. Allah, the Exalted, swore by what He mentioned of His creations to affirm the truth of the promise made in His saying: "Indeed, We have prepared for the disbelievers chains, shackles, and a blazing fire" [Al-Insan: 4] and His saying: "Indeed, we fear from our Lord a Day that is frowning and ominous" [Al-Insan: 10] and His saying: "And He will reward them for what they patiently endured with a garden and silk" [Al-Insan: 12] and the verses up to "And your striving is appreciated" [Al-Insan: 22] and His saying: "And they will leave behind them a heavy day" [Al-Insan: 27] and His saying: "He will admit whom He wills into His mercy, and He has prepared for the wrongdoers a painful punishment" [Al-Insan: 31]. If there were nothing preceding except this promise and the warning that concludes the surah, it would match the opening of the other surah in the strongest way. So how could it be, while the surah "Has there come upon man" [Al-Insan: 1] contains other promises and informative recompenses? So He swore, glorified and exalted is He, by the truth of the occurrence, and He is the Most High, the Truth, and His words are the truth - it has ended.