Sahih Adab al-Mufrad

848/1108 (Sahih) From Usama ibn Zayd: "That the Prophet, peace and blessings be upon him, rode on a donkey that had a saddle covered with a Fadakiyah velvet cloth, and he seated Usama ibn Zayd behind him; he went to visit Sa'd ibn 'Ubadah, until he passed by a gathering in which was Abdullah ibn Ubayy ibn Salul—and that Abdullah had become Muslim (2)—and in the gathering were a mixture of Muslims, polytheists, and idol worshippers, so he greeted them with peace."