مُوَطَّأُ مَالِكٍ
Muwatta Malik 166
Prayer
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي سَلَمَةَ بْنِ عَبْدِ الرَّحْمَنِ بْنِ عَوْفٍ، أَنَّ أَبَا هُرَيْرَةَ، كَانَ يُصَلِّي لَهُمْ فَيُكَبِّرُ كُلَّمَا خَفَضَ وَرَفَعَ فَإِذَا انْصَرَفَ قَالَ وَاللَّهِ إِنِّي لأَشْبَهُكُمْ بِصَلاَةِ رَسُولِ اللَّهِ صلى الله عليه وسلم .
Yahya related to me from Malik from Ibn Shihab from Abu Salama ibn Abdar-Rahman ibn Awf that Abu Hurayra used to lead them in prayer and would say "Allah is greater" whenever he lowered himself and raised himself. When he had finished he would say, "By Allah, I am the person whose prayer most resembles the prayer of the Messenger of Allah, (ﷺ)."
Arabic/English book reference: Book 3, Hadith 20