Musannaf Ibn Abi Shayba 27:589

Waki' narrated to us, he said: Al-Mas'udi narrated to us, from 'Abbas al-'Amiri, from 'Abdullah ibn Shaddad al-Kinani, he said: 'Abdullah used to put the sandals of the Prophet, may Allah bless him and grant him peace, on him, and he would walk in front of him.