Sahih Bukhari Volume 4, Book 58, Hadith 3164

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 الحَوضِ‏"‏‏

Narrated By Yahya bin Said : Once the Prophet 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 theirs 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)."