Muwatta Malik #303
Prayer in Congregation
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّهُ قَالَ قُمْتُ وَرَاءَ عَبْدِ اللَّهِ بْنِ عُمَرَ فِي صَلاَةٍ مِنَ الصَّلَوَاتِ وَلَيْسَ مَعَهُ أَحَدٌ غَيْرِي فَخَالَفَ عَبْدُ اللَّهِ بِيَدِهِ فَجَعَلَنِي حِذَاءَهُ .
Yahya related to me from Malik that Nafi said, "I stood behind
Abdullah ibn Umar in one of the prayers when there was no one else
with him, and he reached behind with his hand and placed me beside
him."
About Muwatta Malik
This hadith is #303 from Muwatta Malik, in the Book of Prayer in Congregation.