The Messenger of Allah ﷺ forbade me to wear gold rings, to wear garments made from a blend of linen and silk, and to use red saddlecloths. (Using translation from Aḥmad 1049)
نَهَانِي رَسُولُ اللهِ ﷺ عَنْ ثَلَاثٍ أَنْ أَتَخَتَّمَ بِالذَّهَبِ وَلُبْسِ الْقَسِّيِّ وَعَنِ الْمِيثَرَةِ