Musnad Ahmad 3116

It was narrated that "Ikrimah said: I said to Ibn 'Abbas: I prayed Zuhr behind a foolish old man; he said takheer in it twenty two times; he said takbeer when he prostrated and when he raised his head from prostration. Ibn 'Abbas said: May you be bereft of your mother! That is the Sunnah of Abul Qasim(ﷺ).