Sahih Bukhari Volume 3, Book 34, Hadith Number 317.

Narated By ‘Abdullah bin Umar : Once the Prophet sent to ‘Umar a silken two-piece garment, and when he saw ‘Umar wearing it, he said to him, “I have not sent it to you to wear. It is worn by him who has no share in the Hereafter, and I have sent it to you so that you could benefit by it (i.e. sell it).”