Messenger of Allah 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."
قَالَ رَسُولُ اللَّهِ ﷺ الرَّهْنُ يُرْكَبُ بِنَفَقَتِهِ إِذَا كَانَ مَرْهُونًا وَلَبَنُ الدَّرِّ يُشْرَبُ بِنَفَقَتِهِ إِذَا كَانَ مَرْهُونًا وَعَلَى الَّذِي يَرْكَبُ وَيَشْرَبُ النَّفَقَةُ