It is narrated from Sayyiduna Ibn Umar (may Allah be pleased with them both) that he saw a caravan of the people of Yemen whose saddles were of leather, and he said: "Whoever would like to look at the caravan that most resembles the Companions of the Messenger of Allah (peace and blessings be upon him), let him look at these."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6122