Muhammad bin Ishaq, among the names of those of the Ansar, then of the Khazraj, then of Banu Mazin bin al-Najjar, who took part in Badr: Qays bin Abi Sa'sa'ah (may Allah be pleased with him); and Abu Sa'sa'ah's name was Amr bin Zayd bin Awf bin Mabdhul bin Amr bin Ghanm bin Mazin bin al-Najjar.
Hadith Referenceالمعجم الكبير للطبراني / باب القاف / 15967