The Prophet ﷺ continued to be asked about the Hour until Allah revealed, "What have you to do with mentioning it? To your Lord belongs its final term" [Naziat 79:43–44], meaning that knowledge of it rests with Allah.
لم يزل النبي ﷺ يسأل عن الساعة، حتى أنزل الله عز وجل: {فيم أنت من ذكراها إلى ربك منتهها} يعني علمها عند الله.
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Bazzar narrated it in Kashf Astar (2279), Ibn Jareer in his commentary on the Quran (24/99), and Hakim (2/513), all of them by way of Sufyan bin Uyayna, from Zuhri, from Urwa, from Ayesha, and he related it.Hakim said, "It is sahih according to the criteria of the two Shaykhs, though they did not include it, for Ibn Uyayna used to drop the intermediate link in it later in his life."I say, this version with the dropped link was narrated by Abdul-Razzaq in his commentary on the Quran (3/390–391) from Ibn Uyayna, from Zuhri, from Urwa bin Zubayr, who said, "The Prophet ﷺ was continually asked about the Hour, until this was revealed, "What have you to do with mentioning it?" [Naziat 79:43], so he stopped being asked about it."However, the ruling belongs to those who narrated it with the full chain intact, especially since those who did so were trustworthy, namely Humaydi, whose name is Abdullah bin Zubayr, as found in Hakim, and Yaqub bin Ibrahim, as found in Ibn Jareer, though Abu Zura preferred the version with the dropped link, as stated in Ilal Ibn Abu Hatim (1693).The governing principle in such cases is that if those who preserved the full chain are precise and trustworthy, even if they are of lesser standing than the one who dropped the link, it is understood that the shaykh himself narrated it with the full chain on one occasion and with the link dropped on another. In that case, the ruling belongs to those who preserved the full chain.I later came across the words of Daraqutni in Ilal (14/126), where he said, "Perhaps Ibn Uyayna narrated it with the full chain once and with the link dropped another time."As for the fact that the two Shaykhs did not include this hadith, that is not because of the disagreement over whether the chain was complete or had a dropped link, but rather for the sake of brevity, since they did not commit to including everything that is sahih.