مُوَطَّأُ مَالِكٍ
Muwatta Malik 369
Shortening the Prayer
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ لاَ يَمُرُّ بَيْنَ يَدَىْ أَحَدٍ وَلاَ يَدَعُ أَحَدًا يَمُرُّ بَيْنَ يَدَيْهِ .
Yahya related to me from Malik from Nafi that Abdullah ibn Umar would neither pass in front of anyone, nor let anyone pass in front of him.
Arabic/English book reference: Book 9, Hadith 40