The Verse:--"When two parties from among you were about to lose heart, but Allah was their Protector," (3.122) was revealed concerning us, and we were the two parties, i.e. Banu Haritha and Banu Salama, and we do not wish (that it had not been revealed) or I would not have been pleased (if it had not been revealed), for Allah says:--"...Allah was their Protector."  

نَحْنُ الطَّائِفَتَانِ بَنُو حَارِثَةَ وَبَنُو سَلِمَةَ وَمَا نُحِبُّ وَقَالَ سُفْيَانُ مَرَّةً وَمَا يَسُرُّنِي أَنَّهَا لَمْ تُنْزَلْ لِقَوْلِ اللَّهِ {وَاللَّهُ وَلِيُّهُمَا}  

Jabir b. Abdullah reported that it was concerning them (the Ansar) that this verse was revealed, that when the two groups amongst you were about to lose heart and Allah was the Guardian of them both. This concerned Banu Salama and Banu Haritha and we did not like that Allah, the Exalted and Glorious, should not have revealed this verse for the fact that Allah (gave an assurance) of being the Guardian of both.  

فِينَا نَزَلَتْ { إِذْ هَمَّتْ طَائِفَتَانِ مِنْكُمْ أَنْ تَفْشَلاَ وَاللَّهُ وَلِيُّهُمَا} بَنُو سَلِمَةَ وَبَنُو حَارِثَةَ وَمَا نُحِبُّ أَنَّهَا لَمْ تَنْزِلْ لِقَوْلِ اللَّهِ ﷻ { وَاللَّهُ وَلِيُّهُمَا}  

[Machine] "That they both fail (to find protection), by Allah, their guardian (protectors) are Banu Salimah and Banu Harithah." Amr said, Jabir said, "And I would not like it if it did not descend (reveal) for (the word of) Allah, 'And Allah is their guardian (protector).'"  

أَنْ تَفْشَلَا وَاللَّهُ وَلِيُّهُمَا} بَنُو سَلِمَةَ وَبَنُو حَارِثَةَ» قَالَ عَمْرٌو قَالَ جَابِرٌ «وَمَا أُحِبُّ أَنَّهَا لَمْ تَنْزِلْ لِقَوْلِ اللَّهِ {وَاللَّهُ وَلِيُّهُمَا} »