‏اللباس والزينة‏ : Hadeeth No:5165 Abu Umama reported Allaah's Messenger (sallAllaahu alayhi wa sallam) having said: He who wore silk in this world would not wear it in the Hereafter....

‏البر والصلة والآداب‏ : Hadeeth No:6211 This hadith has been transmitted on the authority of Zuhri with a slight variation of wording (and the words are):" The one turning away and the other turning away when they meet and one avoids the other and the other also avoids him."...