Hadith
حَدَّثَنَا مَحْمُودُ بْنُ غَيْلاَنَ، حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا سُفْيَانُ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْمُهَلَّبِ بْنِ أَبِي صُفْرَةَ، عَمَّنْ سَمِعَ النَّبِيَّ صلى الله عليه وسلم يَقُولُ " إِنْ بَيَّتَكُمُ الْعَدُوُّ فَقُولُوا: حم لاَ يُنْصَرُونَ " . قَالَ أَبُو عِيسَى وَفِي الْبَابِ عَنْ سَلَمَةَ بْنِ الأَكْوَعِ . وَهَكَذَا رَوَى بَعْضُهُمْ عَنْ أَبِي إِسْحَاقَ مِثْلَ رِوَايَةِ الثَّوْرِيِّ وَرُوِيَ عَنْهُ عَنِ الْمُهَلَّبِ بْنِ أَبِي صُفْرَةَ عَنِ النَّبِيِّ صلى الله عليه وسلم مُرْسَلاً .
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
Sahih · Ahmad Muhammad Shakir
Jami' at-Tirmidhi 1682 ·Book 23, Hadith 13·Also available on sunnah.com·