Sayyiduna Hariz or Abu Hariz (may Allah be pleased with him) narrated: When I reached the Prophet (peace and blessings be upon him) while he (peace and blessings be upon him) was delivering a sermon, "I placed both my hands on the saddle cushion of his (peace and blessings be upon him) mount, and found that it was made of sheepskin."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3565