Sahih Muslim 2676
Abu Huraira reported that Allah's Messenger (ﷺ) was travelling along the path leading to Mecca that he happened to pass by a mountain called Jumdan. He said:
Proceed on, it is Jumdan, Mufarradun have gone ahead. They (the Companions of the Holy Prophet) said: Allah's Messenger, who are Mufarradun? He said: They are those males and females who remember Allah much.
حَدَّثَنَا أُمَيَّةُ بْنُ بِسْطَامَ الْعَيْشِيُّ، حَدَّثَنَا يَزِيدُ، - يَعْنِي ابْنَ زُرَيْعٍ - حَدَّثَنَا رَوْحُ،
 بْنُ الْقَاسِمِ عَنِ الْعَلاَءِ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم
 يَسِيرُ فِي طَرِيقِ مَكَّةَ فَمَرَّ عَلَى جَبَلٍ يُقَالُ لَهُ جُمْدَانُ فَقَالَ ‏"‏ سِيرُوا هَذَا جُمْدَانُ سَبَقَ الْمُفَرِّدُونَ
 ‏"‏ ‏.‏ قَالُوا وَمَا الْمُفَرِّدُونَ يَا رَسُولَ اللَّهِ قَالَ ‏"‏ الذَّاكِرُونَ اللَّهَ كَثِيرًا وَالذَّاكِرَاتُ ‏"‏ ‏.‏