Imran bin Hittan narrated that : He asked 'Abdullah bin 'Abbas about wearing silk. He said: "Ask 'Aishah." "So I asked 'Aishah and she said: “Ask 'Abdullah bin 'Umar.' So I asked Ibn 'Umar and he said: “Abu Hafs told me, that the Messenger of Allah [SAW] said: "Whoever wears silk in this world will have no share in the Hereafter””
SahihSahihSahih - Agreed UponBook 48 · Hadith 267