لَيْسَ عَلَى الْمُسْلِمِ فِي عَبْدِهِ وَلَا فَرَسِهِ صَدَقَةٌ
Translation: No zakat is due from a Muslim on his slave or horse.
This well-known hadith is a key proof for the two disciples’ ruling. Abu Hanifah’s reasoning treats a particular form of grazing, productive horse herd separately.
The disagreement therefore concerns the scope of application across types of ownership.