(a) Sayyiduna Mu'awiyah bin Abi Sufyan (may Allah be pleased with him) said that the Prophet (peace and blessings be upon him) "forbade riding on saddles made of leopard skin, and also forbade wearing gold, except in small pieces."
(b) Abu Shaykh al-Huna'i narrates from Sayyiduna Mu'awiyah (may Allah be pleased with him) that "he forbade riding on leopard skin and on gold saddles."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6120