Sahih al-Bukhari, Volume 3, Book 45, Hadith 689 (USC-MSA) ⓘ
Narrated Abu Huraira: Allah's Messenger 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."
حَدَّثَنَا مُحَمَّدُ بْنُ مُقَاتِلٍ، أَخْبَرَنَا عَبْدُ اللَّهِ، أَخْبَرَنَا زَكَرِيَّاءُ، عَنِ الشَّعْبِيِّ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم. " الرَّهْنُ يُرْكَبُ بِنَفَقَتِهِ إِذَا كَانَ مَرْهُونًا، وَلَبَنُ الدَّرِّ يُشْرَبُ بِنَفَقَتِهِ إِذَا كَانَ مَرْهُونًا، وَعَلَى الَّذِي يَرْكَبُ وَيَشْرَبُ النَّفَقَةُ " .
also referenced under: Book 48, Hadith 5 (In-Book) & Hadith 2512 (DarusSalam)