'Umar bin Al-Khattab (May Allah be pleased with him) reported:
I heard Messenger of Allah ﷺ saying, "Silk (clothes) are worn only by him who has no share in the Hereafter."

[Al-Bukhari and Muslim].

وعنه قال: سمعت رسول الله ﷺ يقول: "إنما يلبس الحرير من لا خلاق له" وفى رواية للبخاري: "من لا خلاق له في الآخرة"