In his sermon, he said that he heard the Messenger of Allah ﷺ say, "Whoever wears silk in this world will not be clothed in it in the Hereafter."
حدثنا عبد الصمد حدثنا أبي حدثنا يزيد يعني الرشك عن معاذة عن أم عمرو ابنة عبد الله أنها سمعت عبد الله بن الزبير يقول سمعت
في خطبته إنه سمع من رسول الله ﷺ يقول من يلبس الحرير في الدنيا فلا يكساه في الآخرة
Its chain of transmission is sahih. Abdul-Samad is the son of Abdul-Warith bin Saeed Anbari. Yazid Rishk is Yazid bin Abu Yazid Dubai, and "Rishk" is pronounced with a kasrah on the ra and a sukoon on the dotted shin, and it is his nickname. It is a Persian word meaning "the one with the big beard." Muazah is the daughter of Abdullah Adawiyyah, the worshipper. Umm Amr is the daughter of Abdullah bin Zubayr, who narrated this hadith from her father.