Abu Dawud Book 8, Hadith Number 2585.
Chapter : Not known.
Narated By Al-Bara’ ibn Azib : Yunus ibn Ubayd, client of Muhammad ibn al-Qasim, said that Muhammad ibn al-Qasim sent to al-Bara’ ibn Azib to ask him about the standard of the Apostle of Allah (PBUH). He said: It was black and square, being made of a woollen rug.