(13) بَابُ بِرِّ الْوَالِدِ الْمُشْرِكِ
Ibn 'Umar said, "'Umar saw a silk robe for sale. He said, 'Messengerof Allah, would you buy this robe and wear it on Jumu'a and when delegationsvisit you?' He replied, 'Only a person who has no portion in the Next Worldcould wear this.' Then the Messenger of Allah, may Allah bless him and granthim peace, was given some robes made of the same material. He sent one ofthe robes to 'Umar. 'Umar exclaimed, 'How can I wear it when you said whatyou said about it?' The Prophet replied, 'I did not give it to you so thatyou could wear it. You can sell it or give it to someone.' 'Umar sent itto a brother of his in Makka who had not yet become Muslim."
Reference: Al-Adab Al-Mufrad 26
In-book reference: Book 1, Hadith 26
English translation: Book 1, Hadith 26