Yahya related to me from Malik from Abdullah ibn Umar from Sulayman ibn Yasar from Irak ibn Malik from Abu Hurayra that the Messenger of Allah ﷺ said, "A muslim does not have to pay any zakat on his slave or his horse."
أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لَيْسَ عَلَى الْمُسْلِمِ فِي عَبْدِهِ وَلاَ فِي فَرَسِهِ صَدَقَةٌ