Sahih al-Bukhari 3163
Narrated Yahya bin Sa`id:
Once the Prophet (ﷺ) called the Ansar in order to grant them part of the land of Bahrain. On that they said, 
"No! By Allah, we will not accept it unless you grant a similar thing to our Quarries brothers as well." 
He said, "That will be their's if Allah wishes." But when the Ansar persisted in their request, he said, 
"After me you will see others given preference over you in this respect (in which case) you should be 
patient till you meet me at the Tank (of Al-Kauthar).
حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، حَدَّثَنَا زُهَيْرٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، قَالَ سَمِعْتُ أَنَسًا ـ رضى الله عنه ـ قَالَ دَعَا النَّبِيُّ صلى الله عليه وسلم الأَنْصَارَ لِيَكْتُبَ لَهُمْ بِالْبَحْرَيْنِ فَقَالُوا لاَ وَاللَّهِ حَتَّى تَكْتُبَ لإِخْوَانِنَا مِنْ قُرَيْشٍ بِمِثْلِهَا‏.‏ فَقَالَ ذَاكَ لَهُمْ مَا شَاءَ اللَّهُ عَلَى ذَلِكَ يَقُولُونَ لَهُ قَالَ ‏
"‏ فَإِنَّكُمْ سَتَرَوْنَ بَعْدِي أُثْرَةً، فَاصْبِرُوا حَتَّى تَلْقَوْنِي ‏عَلَى الْحَوْضِ"‏‏.‏