Musnad Ahmad 25:797

'Affan narrated to us, Hammam narrated to us, from Qatadah, from 'Ikrimah, who said: I prayed behind an old man in Makkah, and he recited twenty-two takbirs in the Dhuhr prayer. So I went to Ibn 'Abbas and said: "I prayed behind a foolish old man, and he recited twenty-two takbirs in the Dhuhr prayer." He said: "May your mother be bereaved of you! That is the Sunnah of Abu al-Qasim, may Allah bless him and grant him peace."