Mishkat al-Masabih 807
‘Ikrima said:
I prayed behind an old man in Mecca and he said the takbir twenty-two times. When I said to Ibn ‘Abbas that the man was a fool, he replied, “I am surprised at you. It was the sunna of Abul Qasim.’’* 

*This is the Prophet’s kunya .

Bukhari transmitted it.
وَعَنْ عِكْرِمَةَ قَالَ: صَلَّيْتُ خَلْفَ شَيْخٍ بِمَكَّةَ فَكَبَّرَ ثِنْتَيْنِ وَعِشْرِينَ تَكْبِيرَةً فَقُلْتُ لِابْنِ عَبَّاسٍ: إِنَّهُ أَحْمَقُ فَقَالَ: ثَكَلَتْكَ أُمُّكَ سُنَّةُ أَبِي الْقَاسِمِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ. رَوَاهُ الْبُخَارِيُّ