Sahih al-Bukhari 4078
Narrated Qatada:
We do not know of any tribe amongst the 'Arab tribes who lost more martyrs than Al-Ansar, and they 
will have superiority on the Day of Resurrection. Anas bin Malik told us that seventy from the Ansar 
were martyred on the day of Uhud, and seventy on the day (of the battle of) Bir Ma'una, and seventy 
on the day of Al-Yamama. Anas added, "The battle of Bir Ma'una took place during the lifetime of 
Allah's Messenger (ﷺ) and the battle of Al-Yamama, during the caliphate of Abu Bakr, and it was the day 
when Musailamah Al-Kadhdhab was killed."
حَدَّثَنِي عَمْرُو بْنُ عَلِيٍّ، حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ، قَالَ حَدَّثَنِي أَبِي، عَنْ قَتَادَةَ، قَالَ مَا نَعْلَمُ حَيًّا مِنْ أَحْيَاءِ الْعَرَبِ أَكْثَرَ شَهِيدًا أَعَزَّ يَوْمَ الْقِيَامَةِ مِنَ الأَنْصَارِ‏.‏ قَالَ قَتَادَةُ وَحَدَّثَنَا أَنَسُ بْنُ مَالِكٍ أَنَّهُ قُتِلَ مِنْهُمْ يَوْمَ أُحُدٍ سَبْعُونَ، وَيَوْمَ بِئْرِ مَعُونَةَ سَبْعُونَ، وَيَوْمَ الْيَمَامَةِ سَبْعُونَ، قَالَ وَكَانَ بِئْرُ مَعُونَةَ عَلَى عَهْدِ رَسُولِ اللَّهِ صلى الله عليه وسلم، وَيَوْمُ الْيَمَامَةِ عَلَى عَهْدِ أَبِي بَكْرٍ يَوْمَ مُسَيْلِمَةَ الْكَذَّابِ‏.‏