(11) باب مَا جَاءَ فِي الشِّعَارِ
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.
Reference: Jami` at-Tirmidhi 1682
In-book reference: Book 23, Hadith 13
English translation: Vol. 3, Book 21, Hadith 1682