Sahih Muslim 7412
صحيح مسلم#7412Sahihحَدَّثَنَا هَارُونُ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا عَفَّانُ بْنُ مُسْلِمٍ، حَدَّثَنَا هَمَّامٌ، حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسٍ، قَالَ مَرَّ غُلاَمٌ لِلْمُغِيرَةِ بْنِ شُعْبَةَ وَكَانَ مِنْ أَقْرَانِي فَقَالَ النَّبِيُّ صلى الله عليه وسلم " إِنْ يُؤَخَّرْ هَذَا فَلَنْ يُدْرِكَهُ الْهَرَمُ حَتَّى تَقُومَ السَّاعَةُ " .
Anas reported:A young boy of Mughira b. Shu'ba happened to pass by (the Holy Prophet) and he was of my age. Thereupon Allah's Apostle (ﷺ) said: If he lives long he would not grow very old till the Last Hour would come (to the old people of this generation)
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 54:173