وَعَنِ الْبَرَاءِ بْنِ عَازِبٍ
أَنَّ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنْ الْمِيثَرَةِ الْحَمْرَاءِ
Al-Bara ibn Azib told that the Prophet (sallallahu alayhi wa sallam) forbade red saddle-cloths. It is transmitted in Sharh as-sunna.
Mishkat al-Masabih 4176, Book 23, Clothing, Hadith 49. 1 min read