"I have never seen anyone whose prayer more closely resembles the prayer of the Messenger of Allah ﷺ than this young man- meaning 'Umar bin Abdul-aziz. And we estimated that when bowing he said the Tasbih ten times and when prostrating he said the Tasbih ten times." (Using translation from Nasāʾī 1135)  

سَمِعْتُ أَنَسًا يَقُولُ مَا رَأَيْتُ أَحَدًا أَشْبَهَ صَلَاةً بِصَلَاةِ رَسُولِ اللهِ ﷺ مِنْ هَذَا الْفَتَى يَعْنِي عُمَرَ بْنَ عَبْدِ الْعَزِيزِ فَحَرَزْنَا فِي رُكُوعِهِ عَشَرَ تَسْبِيحَاتٍ وَفِي سُجُودِهِ عَشَرَ تَسْبِيحَاتٍ