Sunan An-Nasa'i

It was narrated from 'Umar bin Al-Khattab that:He saw a Hullah of Sira' silk being offered for sale at the door of the Masjid. I said: ""O Messenger of Allah, why don't you buy this and wear it on Fridays, and (when meeting) the delegations when they come to you?"" The Messenger of Allah [SAW] said: ""This is only worn by one who has no share in the Hereafter."" After that some (other) Hullahs were brought to the Messenger of Allah [SAW] and he gave me one. He said: ""O Messenger of Allah, you gave me this when you said what you said about it!"" The Prophet [SAW] said: ""I did not give it to you to wear it! Rather I gave it to you to give away or to sell."" So 'Umar gave it to a brother of his son on his mother's side who was an idolater