I was going to Mecca in the company of Abdullah bin Umar and when I apprehended the approaching dawn, I dismounted and offered the Witr prayer and then joined him. Abdullah bin Umar said, ''Where have you been?'' I replied, ''I apprehended the approaching dawn so I dismounted and prayed the Witr prayer.'' Abdullah said, ''Isn't it sufficient for you to follow the good example of Allah's Apostle?'' I replied, ''Yes, by Allah.'' He said, ''Allah's Apostle used to pray Witr on the back of the camel (while on a journey).''