Musannaf Ibn Abi Shayba 13:84

Isma'il narrated to us, from Layth, from Tawus; and from Hisham al-Dastawa'i, from Qatadah, from Jabir ibn Zayd; and from Hisham, from Hammad, from Ibrahim: They said, "There is no usury (riba) between a slave and his master."