Urwah said: "Among the Muslims who were martyred on the day of Ajnadayn, then from Quraysh, then from Banu Sahm, was Sa'id bin al-Harith bin Qays (may Allah be pleased with him)."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5513
Ibn Shihab said: "Among those of Quraysh, then of Banu Sahm, who were martyred on the day of Ajnadayn was Sa'id bin al-Harith bin Qays (may Allah be pleased with him)."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5514