Musannaf Ibn Abi Shayba 19:343

Abu Bakr narrated to us, he said: Muhammad ibn Bishr narrated to us, from Mis'ar, he said: Abu Bakr ibn 'Amr ibn 'Utbah narrated to us, he said: I think he mentioned it from 'Umar that he said: "There is no prescribed punishment (hadd) except in that which steals the intellect."