Hadith 504050
Chapter 9: Shortening the Prayer - كتاب قصر الصلاة فى السفر
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم كَانَ يَأْتِي قُبَاءً رَاكِبًا وَمَاشِيًا .
Yahya related to me from Malik from Nafi from Abdullah ibn Umar that when the Messenger of Allah, may Allah bless him and grant him peace, used to go to Quba (to pray), he would walk as well as ride.
Reference Muwatta Malik 504050
USC-MSA web (English) reference : Book 9, Hadith 74