Musannaf Ibn Abi Shayba 3:3245

Abu al-Ahwas narrated to us, from 'Ata' ibn al-Sa'ib, who said: I went out with Abu 'Abd al-Rahman and Ibn Mughaffal. Abu 'Abd al-Rahman would say the takbir (Allahu Akbar), raising his voice with the takbir. And Ibn Mughaffal would say: "There is no god but Allah alone, He has no partner, to Him belongs the dominion, and to Him belongs the praise, and He is capable of all things."