(4) باب قَوْلِ اللَّهِ تَعَالَى {إِذْ تَسْتَغِيثُونَ رَبَّكُمْ فَاسْتَجَابَ لَكُمْ أَنِّي مُمِدُّكُمْ بِأَلْفٍ مِنْ الْمَلَائِكَةِ مُرْدِفِينَ وَمَا جَعَلَهُ اللَّهُ إِلاَّ بُشْرَى وَلِتَطْمَئِنَّ بِهِ قُلُوبُكُمْ وَمَا النَّصْرُ إِلاَّ مِنْ عِنْدِ اللَّهِ إِنَّ اللَّهَ عَزِيزٌ حَكِيمٌ إِذْ يُغَشِّيكُمُ النُّعَاسَ أَمَنَةً مِنْهُ وَيُنَزِّلُ عَلَيْكُمْ مِنَ السَّمَاءِ مَاءً لِيُطَهِّرَكُمْ بِهِ وَيُذْهِبَ عَنْكُمْ رِجْزَ الشَّيْطَانِ وَلِيَرْبِطَ عَلَى قُلُوبِكُمْ وَيُثَبِّتَ بِهِ الأَقْدَامَ إِذْ يُوحِي رَبُّكَ إِلَى الْمَلاَئِكَةِ أَنِّي مَعَكُمْ فَثَبِّتُوا الَّذِينَ آمَنُوا سَأُلْقِي فِي قُلُوبِ الَّذِينَ كَفَرُوا الرُّعْبَ فَاضْرِبُوا فَوْقَ الأَعْنَاقِ وَاضْرِبُوا مِنْهُمْ كُلَّ بَنَانٍ ذَلِكَ بِأَنَّهُمْ شَاقُّوا اللَّهَ وَرَسُولَهُ وَمَنْ يُشَاقِقِ اللَّهَ وَرَسُولَهُ فَإِنَّ اللَّهَ شَدِيدُ الْعِقَابِ}
Narrated Ibn Masud:
I witnessed Al-Miqdad bin Al-Aswad in a scene which would have been dearer to me than anything had I been the hero of that scene. He (i.e. Al-Miqdad) came to the Prophet (ﷺ) while the Prophet (ﷺ) was urging the Muslims to fight with the pagans. Al-Miqdad said, "We will not say as the People of Moses said: Go you and your Lord and fight you two. (5.27). But we shall fight on your right and on your left and in front of you and behind you." I saw the face of the Prophet (ﷺ) getting bright with happiness, for that saying delighted him.
Reference: Sahih al-Bukhari 3952
In-book reference: Book 64, Hadith 4
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 59, Hadith 288