Sahih Bukhari
Military Expeditions led by the Prophet (pbuh) (Al-Maghaazi)
Volume: 005 / Book Number: 059 / Hadith Number: 697
Narrated Hisham's father:
In my presence, Usama was asked about the speed of the Prophet during his Hajj. He replied, "It was Al-'Anaq (i.e. moderate easy speed) and if he encountered an open space, he used to increase his speed."