عن عمر بن الخطاب رضي الله عنه قَالَ: قَالَ رَسُولُ اللَّهِ - صلى الله عليه وسلم -: «لا تَلْبَسُوا الحَرِير؛ فَإِنَّهُ مَنْ لَبِسَهُ في الدنيا لم يَلبَسه في الآخرة».
[صحيح] - [متفق عليه]
‘Umar ibn al-Khattāb (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "Do not wear silk, for whoever wears it in this world will not wear it in the Hereafter."
Sahih/Authentic. - [Al-Bukhari and Muslim]
This Hadīth contains prohibition of wearing silk for men, and that the punishment for the one who wears it is that he will not wear it in the Hereafter, because the recompense is according to the action.