Sahih Muslim Book - 2, Hadith - 582

و حَدَّثَنَا أَبُو كُرَيْبٍ وَوَاصِلُ بْنُ عَبْدِ الْأَعْلَى وَاللَّفْظُ لِوَاصِلٍ قَالَا حَدَّثَنَا ابْنُ فُضَيْلٍ عَنْ أَبِي مَالِكٍ الْأَشْجَعِيِّ عَنْ أَبِي حَازِمٍ عَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ تَرِدُ عَلَيَّ أُمَّتِي الْحَوْضَ وَأَنَا أَذُودُ النَّاسَ عَنْهُ كَمَا يَذُودُ الرَّجُلُ إِبِلَ الرَّجُلِ عَنْ إِبِلِهِ قَالُوا يَا نَبِيَّ اللَّهِ أَتَعْرِفُنَا قَالَ نَعَمْ لَكُمْ سِيمَا لَيْسَتْ لِأَحَدٍ غَيْرِكُمْ تَرِدُونَ عَلَيَّ غُرًّا مُحَجَّلِينَ مِنْ آثَارِ الْوُضُوءِ وَلَيُصَدَّنَّ عَنِّي طَائِفَةٌ مِنْكُمْ فَلَا يَصِلُونَ فَأَقُولُ يَا رَبِّ هَؤُلَاءِ مِنْ أَصْحَابِي فَيُجِيبُنِي مَلَكٌ فَيَقُولُ وَهَلْ تَدْرِي مَا أَحْدَثُوا بَعْدَكَ.

It was narrated that Abu Hurairah said: "The Messenger of Allah (s.a.w) said: 'My Ummah will come to me at the Cistern (Hawd), and I will be driving the people away from it as a man drives another man's camels away from his own camels." They said: "O Prophet of Allah, will you recognize us?" He said: "Yes. You will have a feature that no one else will have. You will come to 'me with glimmering faces and limbs because of the traces of Wudu'. But a group of you will be prevented from reaching me. I will say: 'O Lord, these are from among my followers.' An angel will reply and say to me: 'Do you know what they innovated after you were gone?"'