I prayed behind a Sheikh at Mecca and he said twenty two Takbirs (during the prayer). I told Ibn ʿAbbas that he (i.e. that Sheikh) was foolish. Ibn ʿAbbas admonished me and said, "This is the tradition of Abul-Qasim."  

صَلَّيْتُ خَلْفَ شَيْخٍ بِمَكَّةَ فَكَبَّرَ ثِنْتَيْنِ وَعِشْرِينَ تَكْبِيرَةً فَقُلْتُ لاِبْنِ عَبَّاسٍ إِنَّهُ أَحْمَقُ فَقَالَ ثَكِلَتْكَ أُمُّكَ سُنَّةُ أَبِي الْقَاسِمِ ﷺ وَقَالَ مُوسَى حَدَّثَنَا أَبَانُ حَدَّثَنَا قَتَادَةُ حَدَّثَنَا عِكْرِمَةُ  

Whenever Messenger of Allah ﷺ stood for the prayer, he said Takbir on starting the prayer and then on bowing. On rising from bowing he said, "Samiʿa llahu liman hamidah," and then while standing straight he used to say, "Rabbana laka-l hamd" (Al- Laith said, "(The Prophet ﷺ said), 'Wa laka l-hamd'." He used to say Takbir on prostrating and on raising his head from prostration; again he would Say Takbir on prostrating and raising his head. He would then do the same in the whole of the prayer till it was completed. On rising from the second rakʿa (after sitting for at-Tahiyyat), he used to say Takbir.  

أَنَّهُ سَمِعَ أَبَا هُرَيْرَةَ يَقُولُ كَانَ رَسُولُ اللَّهِ ﷺ إِذَا قَامَ إِلَى الصَّلاَةِ يُكَبِّرُ حِينَ يَقُومُ ثُمَّ يُكَبِّرُ حِينَ يَرْكَعُ ثُمَّ يَقُولُ سَمِعَ اللَّهُ لَمِنْ حَمِدَهُ حِينَ يَرْفَعُ صُلْبَهُ مِنَ الرَّكْعَةِ ثُمَّ يَقُولُ وَهُوَ قَائِمٌ رَبَّنَا لَكَ الْحَمْدُ قَالَ عَبْدُ اللَّهِ {بْنُ صَالِحٍ عَنِ اللَّيْثِ} وَلَكَ الْحَمْدُ ثُمَّ يُكَبِّرُ حِينَ يَهْوِي ثُمَّ يُكَبِّرُ حِينَ يَرْفَعُ رَأْسَهُ ثُمَّ يُكَبِّرُ حِينَ يَسْجُدُ ثُمَّ يُكَبِّرُ حِينَ يَرْفَعُ رَأْسَهُ ثُمَّ يَفْعَلُ ذَلِكَ فِي الصَّلاَةِ كُلِّهَا حَتَّى يَقْضِيَهَا وَيُكَبِّرُ حِينَ يَقُومُ مِنَ الثِّنْتَيْنِ بَعْدَ الْجُلُوسِ