باب صَدَقَةِ الْفِطْرِ عَلَى الْحُرِّ وَالْمَمْلُوكِ
And Az-Zuhri says that it is also compulsory on the slaves for sale; both the prescribed Zakat on wealth as well as Sadaqat-ul-Fitr are to be paid.
وَقَالَ الزُّهْرِيُّ فِي الْمَمْلُوكِينَ لِلتِّجَارَةِ يُزَكَّى فِي التِّجَارَةِ، وَيُزَكَّى فِي الْفِطْرِ.