"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."  

سَمِعْتُ أَنَسَ بْنَ مَالِكٍ يَقُولُ مَا رَأَيْتُ أَحَدًا أَشْبَهَ صَلاَةً بِصَلاَةِ رَسُولِ اللَّهِ ﷺ مِنْ هَذَا الْفَتَى يَعْنِي عُمَرَ بْنَ عَبْدِ الْعَزِيزِ فَحَزَرْنَا فِي رُكُوعِهِ عَشْرَ تَسْبِيحَاتٍ وَفِي سُجُودِهِ عَشْرَ تَسْبِيحَاتٍ  

I did not offer behind anyone after the Messenger of Allah ﷺ a prayer like the prayer offered by the Messenger of Allah ﷺ than this youth, i.e. Umar ibn AbdulAziz. We estimated reciting glorification ten times in his bowing, and in his prostration ten times. Abu Dawud said: Ahmad b. Salih said: I asked him ('Abd Allah) whether the name Manus is correct of Mabus. He replied: 'Abd al-Razzaq used to say Mabus, but I remember Manus (i.e. the narrator Wahb b. Manus). These are the words of Ibn Rafi'. It has also been narrated by Ahmad from Sa'id b. Jubair on the authority of Anas b. Malik.  

سَمِعْتُ أَنَسَ بْنَ مَالِكٍ يَقُولُ مَا صَلَّيْتُ وَرَاءَ أَحَدٍ بَعْدَ رَسُولِ اللَّهِ ﷺ أَشْبَهَ صَلاَةً بِرَسُولِ اللَّهِ ﷺ مِنْ هَذَا الْفَتَى يَعْنِي عُمَرَ بْنَ عَبْدِ الْعَزِيزِ قَالَ فَحَزَرْنَا فِي رُكُوعِهِ عَشْرَ تَسْبِيحَاتٍ وَفِي سُجُودِهِ عَشْرَ تَسْبِيحَاتٍ  

"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)   

مَا رَأَيْتُ أَحَدًا أَشْبَهَ بِصَلَاةِ رَسُولِ اللهِ ﷺ مِنْ هَذَا الْغُلَامِ يَعْنِي عُمَرَ بْنَ عَبْدِ الْعَزِيزِ قَالَ فَحَزَرْنَا فِي الرُّكُوعِ عَشْرَ تَسْبِيحَاتٍ وَفِي السُّجُودِ عَشْرَ تَسْبِيحَاتٍ