How was the sandal of the Messenger of Allah ﷺ? He replied, "It had two straps."
حدثنا محمد بن بشار حدثنا أبو داود حدثنا همام عن قتادة قال
كيف كان نعل رسول الله ﷺ قال لهما قبالان
No references are available.
Recorded also by Bukhari, Book of Clothing, chapter on two straps on a sandal and on the view that one wide strap suffices, hadith no. 5857, from the hadith of Hammam through the same chain.