Sahih Muslim 2532 a
Abu Sa'id Khudri reported Allah's Apostle (ﷺ) as saying:
A time would come for the people when groups of people would set out for fighting in the cause of Allah and it would be said to them: Is there one amongst you who saw Allah's Messenger (ﷺ)? And they would say: Yes, and they would be victorious. Then the people would set out for fighting in the cause of Allah and it would be said to them: Is there one amongst you who saw those (who have had the privilege of sitting in the company of Allah's Messenger (ﷺ)? And they would say: Yes, and victory would be granted to them. Then a group of persons would set out for fighting in the cause of Allah and it would be said to them: Is there one amongst you who saw one of those who saw those who (had the privilege) of sitting in the company of Allah's Messenger (ﷺ)? And they would say: Yes, and the Victory would be granted to them.
حَدَّثَنَا أَبُو خَيْثَمَةَ، زُهَيْرُ بْنُ حَرْبٍ وَأَحْمَدُ بْنُ عَبْدَةَ الضَّبِّيُّ - وَاللَّفْظُ لِزُهَيْرٍ -
 قَالاَ حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، قَالَ سَمِعَ عَمْرٌو، جَابِرًا يُخْبِرُ عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، عَنِ 
 النَّبِيِّ صلى الله عليه وسلم قَالَ ‏
"‏ يَأْتِي عَلَى النَّاسِ زَمَانٌ يَغْزُو فِئَامٌ مِنَ النَّاسِ فَيُقَالُ
 لَهُمْ فِيكُمْ مَنْ رَأَى رَسُولَ اللَّهِ صلى الله عليه وسلم فَيَقُولُونَ ‏.‏ نَعَمْ فَيُفْتَحُ لَهُمْ ثُمَّ يَغْزُو فِئَامٌ
 مِنَ النَّاسِ فَيُقَالُ لَهُمْ فِيكُمْ مَنْ رَأَى مَنْ صَحِبَ رَسُولَ اللَّهِ صلى الله عليه وسلم فَيَقُولُونَ
 نَعَمْ ‏.‏ فَيُفْتَحُ لَهُمْ ثُمَّ يَغْزُو فِئَامٌ مِنَ النَّاسِ فَيُقَالُ لَهُمْ هَلْ فِيكُمْ مَنْ رَأَى مَنْ صَحِبَ مَنْ
 صَحِبَ رَسُولَ اللَّهِ صلى الله عليه وسلم فَيَقُولُونَ نَعَمْ ‏.‏ فَيُفْتَحُ لَهُمْ ‏"‏ ‏.‏