Musnad Ahmad 1018:31

Yazid narrated to us, Sufyan informed us, from ‘Asim al-Ahwal, from Abu Tamimah al-Hujaymi, from the one who rode behind the Prophet (may Allah bless him and grant him peace), or the one who narrated to him from the one who rode behind the Prophet (may Allah bless him and grant him peace), that he was riding behind him when his mount stumbled. He said: "May the devil perish." He (the Prophet) said: "Do not say that, for he grows great when you say that, until he becomes like a mountain, and he says: 'By my strength I threw him down.' But if you say: 'In the name of Allah (Bismillah),' he shrinks until he becomes like a fly."