Hadithcore
Sahih Muslim, 148 a
sahih

It is narrated on the authority of Anas that verily the Messenger of Allah (ﷺ) said:

"The Hour (Resurrection) will not occur until 'Allah, Allah' is not said on earth."

حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا عَفَّانُ، حَدَّثَنَا حَمَّادٌ، أَخْبَرَنَا ثَابِتٌ، عَنْ أَنَسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏

‏ لاَ تَقُومُ السَّاعَةُ حَتَّى لاَ يُقَالَ فِي الأَرْضِ اللَّهُ اللَّهُ ‏

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References2 variants
In-Book Reference
Book 1, Hadith 282
USC-MSA web (English) reference
Book 1, Hadith 273 (deprecated numbering scheme)
Sharh · explanationclick to expand
At the end of this worldly life, lots of issues will change while immorality and disobedience will spread. At that time, Allah will allow the beginning of Resurrection's Day. In this hadith, the Prophet (ﷺ) confirmed that this day will not come as long as anyone says, "Allah, Allah." It means that there will not be anyone who remembers the name of Allah or worship him. There will be just the evilest people, for Allah has taken the believers' souls, as in Sahih Muslim that Amr ibn Al-Aas narrated that the Prophet said, “Then Allah will raise a wind whose smell is similar to musk and whose touch is similar to silk. It will cause any person who has the weight of a seed of faith in his heart to die. Then only the evilest people will remain to witness the beginning of the Resurrection Day." This does not contradict what was authentically proven in Sahih Muslim that Jaber ibn Abdullah narrated that the Prophet (ﷺ) said, “A group of my nation will always fight for the sake of rightness and overcome (their enemies) till the day of resurrection," for it means they would be like that till that light wind causes them to die before the Day of Resurrection when its signs begins to appear. Finally, this hadith contains the following lessons: (1) It shows a sign of the Prophet's prophethood, (2) It clarifies the virtue of the believers, for Allah will honor them by causing them to die before the hereafter, and (3) It confirms the virtue of remembering Allah, for those remembering him will not witness the beginning of the Day of Resurrection..
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