I grieved deeply for those who were killed at the Battle of Harrah. Word of my intense grief reached Zayd bin Arqam, so he wrote to me mentioning that he had heard the Messenger of Allah ﷺ say, "O Allah, forgive the Ansar, the sons of the Ansar," and Ibn Fadl was uncertain whether he also said, "and the sons of the sons of the Ansar."One of those present asked Anas about him, and he said, "This is the one about whom the Messenger of Allah ﷺ said, 'This is the one whose ear Allah honored by fulfilling what he heard.'"
حزنت على من أصيب بالحرة، فكتب إلي زيد بن أرقم، وبلغه شدة حزني، يذكر أنه سمع رسول الله ﷺ يقول: اللهم اغفر للأنصار ولأبناء الأنصار وشك ابن الفضل في: أبناء أبناء الأنصار فسأل أنسا بعض من كان عنده، فقال: هو الذي يقول رسول الله ﷺ: هذا الذي أوفى الله له بأذنه.
Bukhari narrated it in tafsir (4906) from Ismail bin Abdullah, who said, Ismail bin Ibrahim bin Uqba narrated to me, from Musa bin Uqba, who said, Abdullah bin Fadl narrated to me, that he heard Anas bin Malik say, and he mentioned it.Muslim narrated it in the merits of the companions (2506) from another route, from Zayd bin Arqam, as a raised report, and he mentioned in it, "the sons of the sons of the Ansar," without any doubt.