(15) باب خَيْرُ مَالِ الْمُسْلِمِ غَنَمٌ يَتْبَعُ بِهَا شَعَفَ الْجِبَالِ
Narrated Abu Sa`id al-Khudri:
Allah's Messenger (ﷺ) said, "There will come a time when the best property of a man will be sheep which he will graze on the tops of mountains and the places where rain falls (i.e. pastures) escaping to protect his religion from afflictions."
Reference: Sahih al-Bukhari 3300
In-book reference: Book 59, Hadith 108
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 4, Book 54, Hadith 519