Urwah said that among the Ansar who took part in Badr, then from Banu Sawwad bin Ka'b (Ka'b's name was Zafar), is the name of Sayyiduna Sa'd bin Ubayd bin al-Nu'man (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5466