Musnad Ahmad 25:49

Ibn Abi ‘Adi narrated to us, from Sa‘id, from Qatadah, from ‘Ikrimah, who said: I said to Ibn ‘Abbas: I prayed the Dhuhr prayer at al-Batha’ behind a foolish old man, and he said twenty-two takbirs; he would say takbir when he prostrated and when he raised his head. He said: So Ibn ‘Abbas said: "That is the prayer of Abu al-Qasim, upon him be prayer and peace."