سُنَنُ النَّسَائِيِّ
Sunan an-Nasa’i 1155
The Book of The At-Tatbiq (Clasping One's Hands Together)
The takbir when getting up
أَخْبَرَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، عَنْ مَالِكٍ، عَنِ ابْنِ شِهَابٍ، عَنْ أَبِي سَلَمَةَ، أَنَّ أَبَا هُرَيْرَةَ، كَانَ يُصَلِّي بِهِمْ فَيُكَبِّرُ كُلَّمَا خَفَضَ وَرَفَعَ فَإِذَا انْصَرَفَ قَالَ وَاللَّهِ إِنِّي لأَشْبَهُكُمْ صَلاَةً بِرَسُولِ اللَّهِ صلى الله عليه وسلم .
It was narrated from Abu Salamah : That Abu Hurairah used to lead them in prayer, and he said the takbir when he went down and came up. When he had finished he said: 'By Allah (SWT), I am the one among you whose prayer most closely resembles that of the Messenger of Allah (ﷺ).'"
Sunan an-Nasa'i, 1155Sahih (Darussalam)