Muwatta Malik #398
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)."
About Muwatta Malik
This hadith is #398 from Muwatta Malik, in the Book of Shortening the Prayer. Muwatta Malik contains 1,985 hadiths across 61 books.