Muhammad bin Ishaq narrated that among those of the Ansar who took part in Badr, then from al-Aws, is the name of Sayyiduna Sa'd bin Khaythamah bin al-Harith bin Malik bin Ka'b bin al-Nahhat bin Ka'b bin Harithah bin Ghanm bin al-Salm bin Imri' al-Qays bin Malik bin al-Aws (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5398