«كحديث المسح على الخفين»
Such as the report concerning wiping over leather footwear.
Khuffayn denotes the prescribed type of leather footwear involved in the jurisprudential discussion of wiping with specified conditions. The book uses this as an example of mashhur.
The point is the mode and reception of transmission, not every legal condition of wiping. In this usuli framework, a report initially limited can attain widespread acceptance in a subsequent generation.