Sayyiduna Ka'b bin Malik (may Allah be pleased with him) said: We set out for the Hajj in which we pledged allegiance to the Messenger of Allah (peace and blessings be upon him), and at that time the naqib (chief representative) of Banu Amr bin Awf was Sayyiduna Sa'd bin Khaythamah (may Allah be pleased with him).
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5399