Sahih al-Bukhari 2511
Sahih al-Bukhari · Book 48: Mortgaging · To mortgage an animal used for riding or milking
Narrated Abu Huraira:
حَدَّثَنَا أَبُو نُعَيْمٍ ، حَدَّثَنَا زَكَرِيَّاءُ ، عَنْ عَامِرٍ ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ كَانَ يَقُولُ " الرَّهْنُ يُرْكَبُ بِنَفَقَتِهِ، وَيُشْرَبُ لَبَنُ الدَّرِّ إِذَا كَانَ مَرْهُونًا " .
The Prophet (ﷺ) said, "One can ride the mortgaged animal because of what one spends on it, and one can drink the milk of a milch animal as long as it is mortgaged. "