(91) باب الصَّلاَةِ فِي النَّعْلِ
This tradition has also been transmitted through a chain by Bakr b. 'Abd Allah. This version has the word Khubuth (filth) and in two places the word Khubuthan (filth).
Reference: Sunan Abi Dawud 651
In-book reference: Book 2, Hadith 261
English translation: Book 2, Hadith 651