Ibn Shihab narrated that among those of the Ansar who were martyred on the day of Uhud, then from Banu al-Harith bin al-Khazraj, is the name of Sayyiduna Sa'd bin al-Rabi' (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5381