Sunan Ibn Majah, Chapter: The Chapters of Establishing the Prayer and the Sunnah Regarding Them

that his father told him: "We were with Ibn Umar on a journey, and he led us in prayer. Then we finished with him and he finished turning around, and saw some people praying. He said: 'What are these people doing?' I said: 'Glorifying Allah.'* He said: 'If I wanted to glorify Allah (perform voluntary prayer) I would have completed my prayer. O son of my brother! I accompanied the Messenger of Allah (saw) and he never prayed more than two Rakah when he was traveling, until Allah took his soul. Then I accompanied Abu Bakr and he never prayed more than two Rakah (when he was traveling), until Allah took his soul. Then I accompanied Umar and he never prayed more than two Rakah, until Allah took his soul. Then I accompanied Uthman and he never prayed more than two Rakah, until Allah took his soul. Allah says: 'Indeed in the Messnger of Allah (Muhammad (saw)) you have a good example to follow.'" [33:21]