(4) باب الرَّهْنُ مَرْكُوبٌ وَمَحْلُوبٌ
Narrated Abu Huraira:
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. "
Reference: Sahih al-Bukhari 2511
In-book reference: Book 48, Hadith 4
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 3, Book 45, Hadith 688