‏اللباس والزينة‏ : Hadeeth No:5153 Abu 'Uthman reported: While we were with 'Utba b. Farqad there came a letter of 'Umar (containing the instructions) that Allaah's Messenger (sallAllaahu alayhi wa sallam) had said: None should wear silk (with the exception of so much) but he will have nothing of it in the Hereafter. Abu 'Uthman said...

‏الإمارة : Hadeeth No:4488 The same tradition has been narrated through a different chain of transmitters....