Musannaf Ibn Abi Shayba 16:312

Abu Bakr narrated to us, he said: Hushaym and Sharik narrated to us, from Ya'la ibn 'Ata, from 'Amr ibn al-Sharid, from his father, who said: There was a leper among the delegation of Thaqif. The Prophet, may Allah bless him and grant him peace, sent word to him: "We have accepted your pledge of allegiance, so return."