The Messenger of Allah ﷺ came to the graveyard and said: "Peace be upon you! The abode of the believing people and we, if God so wills, are about to join you. I love to see my brothers." They (the hearers) said: Aren't we your brothers, O Messenger of Allah? He said: You are my companions, and our brothers are those who have, so far, not come into the world. They said: Messenger of Allah, how would you recognise those persons of your Ummah who have not yet been born? He said: Supposing a man had horses with white blazes on foreheads and legs among horses which were all black, tell me, would he not recognise his own horses? They said: Certainly, O Messenger of Allah. He said: They would come with white faces and arms and legs owing to ablution, and I would arrive at the Cistern before them. Some people would be driven away from my Cistern as the stray camel is driven away. I would call out: Come, come. Then it would be said (to me): These people changed themselves after you, and I would say: Be off, be off. (Using translation from Muslim 249a)
خَرَجَ رَسُولُ اللهِ ﷺ إِلَى الْمَقْبَرَةِ فَسَلَّمَ عَلَى أَهْلِهَا قَالَ سَلَامٌ عَلَيْكُمْ دَارَ قَوْمٍ مُؤْمِنِينَ وَإِنَّا إِنْ شَاءَ اللهُ بِكُمْ لَاحِقُونَ وَدِدْتُ أَنَّا قَدْ رَأَيْنَا إِخْوَانَنَا قَالُوا أَوَلَسْنَا بإِخْوَانَكَ يَا رَسُولَ اللهِ؟ قَالَ بَلْ أَنْتُمْ أَصْحَابِي وَإِخْوَانِي الَّذِينَ لَمْ يَأْتُوا بَعْدُ وَأَنَا فَرَطُهُمْ عَلَى الْحَوْضِ قَالُوا وَكَيْفَ تَعْرِفُ مَنْ لَمْ يَأْتِ بَعْدُ مِنْ أُمَّتِكَ يَا رَسُولَ اللهِ؟ قَالَ أَرَأَيْتَ لَوْ أَنَّ رَجُلًا لَهُ خَيْلٌ غُرٌّ مُحَجَّلَةٌ بَيْنَ ظَهْرَيْ خَيْلٍ دُهْمٍ بُهْمٍ أَلَا يَعْرِفُ خَيْلَهُ؟ قَالُوا بَلَى يَا رَسُولَ اللهِ قَالَ فَإِنَّهُمْ يَأْتُونَ غُرًّا مُحَجَّلِينَ مِنَ الْوُضُوءِ يَقُولُهَا ثَلَاثًا وَأَنَا فَرَطُهُمْ عَلَى الْحَوْضِ أَلَا لَيُذَادَنَّ رِجَالٌ عَنْ حَوْضِي كَمَا يُذَادُ الْبَعِيرُ الضَّالُّ أُنَادِيهِمْ أَلَا هَلُمَّ فَيُقَالُ إِنَّهُمْ قَدْ بَدَّلُوا بَعْدَكَ فَأَقُولُ سُحْقًا سُحْقًا