This Verse: "When two of your parties almost Decided to fall away..." was revealed in our connection, i.e. Bani Salama and Bani Haritha and I would not have liked that, if it was not revealed, for Allah said:-- But Allah was their Protector.....(3.122)  

نَزَلَتْ هَذِهِ الآيَةُ فِينَا {إِذْ هَمَّتْ طَائِفَتَانِ مِنْكُمْ أَنْ تَفْشَلاَ} بَنِي سَلِمَةَ وَبَنِي حَارِثَةَ وَمَا أُحِبُّ أَنَّهَا لَمْ تَنْزِلْ وَاللَّهُ يَقُولُ {وَاللَّهُ وَلِيُّهُمَا}  

ʿAbdullah bin Al-Fadl told me that Anas bin Malik said, "I was much grieve over those who had been killed in the Battle of Al-Harra. When Zaid bin Arqarr heard of my intense grief (over the killed Ansar), he wrote a letter to me saying that he heard Messenger of Allah ﷺ saying, O Allah! Forgive the Ansar and the Ansar children.  

حَزِنْتُ عَلَى مَنْ أُصِيبَ بِالْحَرَّةِ فَكَتَبَ إِلَىَّ زَيْدُ بْنُ أَرْقَمَ وَبَلَغَهُ شِدَّةُ حُزْنِي يَذْكُرُ أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ يَقُولُ: «اللَّهُمَّ اغْفِرْ لِلأَنْصَارِ وَلأَبْنَاءِ الأَنْصَارِ۔»  

The Prophet ﷺ saw the women and children (of the Ansar) coming forward. (The sub-narrator said, "I think that Anas said, 'They were returning from a wedding party.") The Prophet ﷺ stood up and said thrice, "By Allah! You are from the most beloved people to me."  

رَأَى النَّبِيُّ ﷺ النِّسَاءَ وَالصِّبْيَانَ مُقْبِلِينَ قَالَ حَسِبْتُ أَنَّهُ قَالَ مِنْ عُرُسٍ فَقَامَ النَّبِيُّ ﷺ مُمْثِلاً فَقَالَ اللَّهُمَّ أَنْتُمْ مِنْ أَحَبِّ النَّاسِ إِلَىَّ قَالَهَا ثَلاَثَ مِرَارٍ  

Once an Ansari woman, accompanied by a son of hers, came to Messenger of Allah ﷺ. Messenger of Allah ﷺ spoke to her and said twice, "By Him in Whose Hand my life is, you are the most beloved people to me."  

جَاءَتِ امْرَأَةٌ مِنَ الأَنْصَارِ إِلَى رَسُولِ اللَّهِ ﷺ وَمَعَهَا صَبِيٌّ لَهَا فَكَلَّمَهَا رَسُولُ اللَّهِ ﷺ فَقَالَ وَالَّذِي نَفْسِي بِيَدِهِ إِنَّكُمْ أَحَبُّ النَّاسِ إِلَىَّ مَرَّتَيْنِ  

The Prophet ﷺ said, "The Ansar are my near companions to whom I confided my private secrets, People will go on increasing but the Ansar will go on decreasing; so accept the good of the good-doers amongst them and excuse the wrong-doers amongst them. "  

عَنِ النَّبِيِّ ﷺ قَالَ الأَنْصَارُ كَرِشِي وَعَيْبَتِي وَالنَّاسُ سَيَكْثُرُونَ وَيَقِلُّونَ فَاقْبَلُوا مِنْ مُحْسِنِهِمْ وَتَجَاوَزُوا عَنْ مُسِيئِهِمْ