جامع الترمذي

Narrated Al-Muhallab bin Abi Sufrah:

From one who heard the Prophet (ﷺ) saying: "If you suffer a surprise attack from the enemy then say: 'Ha Min, they will not be victorious.'"

[Abu 'Eisa said:] There is something on this topic from Salamah bin Al-Akwa'. This is how some of them reported it from Abu Ishaq, the same as the narration of Ath-Thawri. And it has been reported from him, from Al-Muhallab bin Abi Sufrah from the Prophet (ﷺ) in Mursal form.