Imran bin Hittan asked Ibn Abbas (may Allah be pleased with them both) about silk, and he said: Ask Sayyidah Aishah (may Allah be pleased with her). I asked her, and she said: Ask Ibn Umar (may Allah be pleased with them both). I asked Ibn Umar (may Allah be pleased with them both), and he said: Abu Hafs (may Allah be pleased with him) narrated to me that the Messenger of Allah (peace and blessings be upon him) said: "Whoever wears silk in this world has no share in the Hereafter."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6064
It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "Whoever wears silk in this world will have no share in the Hereafter."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6065
Ibn Abi Layla (may Allah have mercy on him) said: Sayyiduna Hudhayfah (may Allah be pleased with him) asked for water, and a farmer brought him water in a silver vessel; he took it and threw it, and said: The Messenger of Allah (peace and blessings be upon him) "forbade us to eat and drink from vessels of gold and silver and to wear thick and fine silk, and he forbade sitting on it," and he (peace and blessings be upon him) said: "It is for them in this world and for you in the Hereafter."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6066
Bara' bin Azib (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) commanded us to do seven things and forbade us seven: he commanded us "to visit the sick, to pray the funeral prayer, to spread the greeting of salam, to accept invitations, to respond to one who sneezes, to help the oppressed, and to keep oaths true; and he forbade us to drink from silver vessels, for whoever drinks from these vessels in this world will not drink from them in the Hereafter; and he forbade gold rings, silk saddle cushions, cloth made of qassi, and wearing thick and fine silk."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6067
Safwan bin Abdullah bin Safwan (may Allah have mercy on him) said: Sayyiduna Sa'd (may Allah be pleased with him) asked permission to enter upon Ibn Amir (may Allah be pleased with them both), and beneath him was a silk spread; he ordered it to be removed. Then he entered, and on him was a silk cloak. Ibn Amir (may Allah be pleased with them both) said: O Sa'd! You asked permission while there was a silk spread beneath me, so I had it removed. Sayyiduna Sa'd (may Allah be pleased with him) said: O Ibn Amir! You are a good man, provided you are not among those of whom Allah, the Lord of Might, said: "You exhausted your good things in your worldly life" [Surah al-Ahqaf: 20]. Then he said: By Allah! Lying on the embers of tamarisk wood is dearer to me than lying on it.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6070
Sufyan mentions a similar hadith, and in it there are some additional words: He said: O Abu Ishaq! What you are wearing is partly silk and partly something else, that is, woollen cloth (khazz). He said: What touches my body is the woollen cloth.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة الخوف / 6071