They ask you about the Hour (Day of Resurrection): "When will be its appointed time?" Say: "The knowledge thereof is with my Lord (Alone). None can reveal its time but He. Heavy is its burden through the heavens and the earth. It shall not come upon you except all of a sudden." They ask you as if you have a good knowledge of it. Say: "The knowledge thereof is with Allah (Alone), but most of mankind know not. (187)
The Last Hour and its Portents
Allah said here,
يَسْأَلُونَكَ عَنِ السَّاعَةِ
(They ask you about the Hour), just as He said in another Ayah,
يَسْأَلُكَ النَّاسُ عَنِ السَّاعَةِ
(People ask you concerning the Hour)[33:63].
It was said that this Ayah was revealed about the Quraysh or the Jews, although it appears that it was about the Quraysh, because this Ayah was revealed in Makkah. The Quraysh used to ask about the Last Hour, because they used to deny it and discount its coming. For instance, Allah said in another Ayah,
وَيَقُولُونَ مَتَىٰ هَٰذَا الْوَعْدُ إِن كُنتُمْ صَادِقِينَ
(And they say: "When will be this promise (the torment or the Day of Resurrection), if you speak the truth?")[10:48], and,
يَسْتَعْجِلُ بِهَا الَّذِينَ لَا يُؤْمِنُونَ بِهَا وَالَّذِينَ آمَنُوا مُشْفِقُونَ مِنْهَا وَيَعْلَمُونَ أَنَّهَا الْحَقُّ أَلَا إِنَّ الَّذِينَ يُمَارُونَ فِي السَّاعَةِ لَفِي ضَلَالٍ بَعِيدٍ
(Those who believe not therein seek to hasten it, while those who believe are fearful of it, and know that it is the very truth. Verily, those who dispute concerning the Hour are certainly in error far away)[42:18].
Allah said here (that the Quraysh asked),
أَيَّانَ مُرْسَاهَا
("When will be its appointed time?") in reference to its commencement, according to 'Ali bin Abi Talhah who reported this from Ibn 'Abbas. They asked about the Hour's appointed term and when the end of this world will begin;
قُلْ إِنَّمَا عِلْمُهَا عِندَ رَبِّي لَا يُجَلِّيهَا لِوَقْتِهَا إِلَّا هُوَ
(Say: "The knowledge thereof is with my Lord (Alone). None can reveal its time but He.")
Allah commanded His Messenger ﷺ that when asked about the appointed term of the Last Hour, he referred its knowledge to Allah, the Exalted. Only Allah knows the Last Hour's appointed term and when it will certainly occur, and none besides Him has this knowledge,
ثَقُلَتْ فِي السَّمَاوَاتِ وَالْأَرْضِ
(Heavy is its burden through the heavens and the earth)
'Abdur-Razzaq narrated that Ma'mar said that Qatadah commented on this Ayah,
ثَقُلَتْ فِي السَّمَاوَاتِ وَالْأَرْضِ
(Heavy is its burden through the heavens and the earth)
"Its knowledge is heavy on the residents of the heavens and earth, they do not have knowledge in it." Also, Ma'mar said that Al-Hasan commented on this Ayah, "When the Last Hour comes, it will be heavy on the residents of the heavens and earth."
Ad-Dahhak said that Ibn 'Abbas explained this Ayah,
ثَقُلَتْ فِي السَّمَاوَاتِ وَالْأَرْضِ
(Heavy is its burden through the heavens and the earth,) saying, "All creatures will suffer its heaviness on the Day of Resurrection." Ibn Jurayj also said about this Ayah,
ثَقُلَتْ فِي السَّمَاوَاتِ وَالْأَرْضِ
(Heavy is its burden through the heavens and the earth.)
"When it commences, the heavens will be …