Narrated Hafs bin `Asim: Ibn `Umar went on a journey and said, "I accompanied the Prophet and he did not offer optional prayers during the journey, and Allah says: 'Verily! In Allah's Apostle you have a good example to follow.' " (33.21)
Hadith Referenceصحيح البخاري / كتاب تقصير الصلاة / 1101
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة
Narrated Ibn `Umar: I accompanied Allah's Apostle and he never offered more than two rak`at during the journey. Abu Bakr, `Umar and `Uthman used to do the same.
Hadith Referenceصحيح البخاري / كتاب تقصير الصلاة / 1102
Hadith Gradingمحدثین:أحاديث صحيح البخاريّ كلّها صحيحة