(4) باب الرَّهْنُ مَرْكُوبٌ وَمَحْلُوبٌ
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "The mortgaged animal can be used for riding as long as it is fed and the milk of the milch animal can be drunk according to what one spend on it. The one who rides the animal or drinks its milk should provide the expenditures."
Reference: Sahih al-Bukhari 2512
In-book reference: Book 48, Hadith 5
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 45, Hadith 689