كتاب قصر الصلاة فى السفر
9  
Shortening the Prayer

Yahya related to me from Malik that Abu Jafar al-Qari said, "I was praying, and Abdullah ibn Umar was behind me and I was not aware of it. Then I turned round and he prodded me (in disapproval)."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ أَبِي جَعْفَرٍ الْقَارِئِ، أَنَّهُ قَالَ كُنْتُ أُصَلِّي وَعَبْدُ اللَّهِ بْنُ عُمَرَ وَرَائِي وَلاَ أَشْعُرُ فَالْتَفَتُّ فَغَمَزَنِي ‏.‏
USC-MSA web (English) reference : Book 9, Hadith 66
Arabic reference : Book 9, Hadith 397