Hadith 666:3
Waki' narrated to us, Sufyan narrated to us, from al-Suddi, from someone who heard 'Amr ibn Hurayth saying: "The Messenger of Allah (peace and blessings of Allah be upon him) prayed in his sandals."
حدثنا وكيع، حدثنا سفيان، عن السدي، عمن، سمع عمرو بن حريث يقول: " صلى رسول الله صلى الله عليه وسلم في نعليه "