Musa bin Talhah narrates: I travelled with Ibn Umar (may Allah be pleased with them both) between Makkah and Madinah; he would not pray more than two rak'ahs (in the obligatory prayer), praying nothing before them nor after, and he would say: "I pray just as I saw my companions (the Companions) praying, and I do not prevent anyone who wishes to do more good."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 13199