Urwah narrates: "Among the Ansar who were martyred on the Day of Bi'r Ma'unah, then from Banu al-Najjar, was Sahl bin Amir bin Sa'd bin Amr bin Thaqif (may Allah be pleased with him)."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5625
Ibn Shihab narrates: "Among the Ansar who were martyred on the Day of Bi'r Ma'unah, then from Banu al-Najjar, was Sahl bin Amir bin Sa'd (may Allah be pleased with him)."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5626