Sunan An-Nasa'i

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