Hadith 502200
Chapter 3: Prayer - كتاب الصلاة
وَحَدَّثَنِي مَالِكٌ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم لَبِسَ خَمِيصَةً شَامِيَّةً لَهَا عَلَمٌ ثُمَّ أَعْطَاهَا أَبَا جَهْمٍ وَأَخَذَ مِنْ أَبِي جَهْمٍ أَنْبِجَانِيَّةً لَهُ فَقَالَ يَا رَسُولَ اللَّهِ وَلِمَ فَقَالَ " إِنِّي نَظَرْتُ إِلَى عَلَمِهَا فِي الصَّلاَةِ " .
Malik related to me from Hisham ibn Urwa from his father that the Messenger of Allah, may Allah bless him and grant him peace, wore a fine striped garment f rom Syria, and then gave it to Abu Jahm and took a plain, rough, garment in return. Abu Jahm asked, "Messenger of Allah! Why?" He said, "I looked at its stripes in the prayer."
Reference Muwatta Malik 502200
USC-MSA web (English) reference : Book 3, Hadith 73