Hadith 943 - Fear Prayer - Sahih Al-Bukhari - صحيح البخاري - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

12. Fear Prayer - كتاب صلاة الخوف

2) Chapter: The Salat-ul-Khauf while standing or riding

Narrated Nafi`:

Ibn `Umar said something similar to Mujahid's saying: Whenever (Muslims and non-Muslims) stand face to face in battle, the Muslims can pray while standing. Ibn `Umar added, "The Prophet (ﷺ) said, 'If the number of the enemy is greater than the Muslims, they can pray while standing or riding (individually).' "

Reference: 943
English reference: Vol. 2, Book 14, Hadith 65
In-book reference: Book 12, Hadith 2
Grade: Sahih
Read this hadith from Darussalam Collection

2) باب صَلاَةِ الْخَوْفِ رِجَالاً وَرُكْبَانًا رَاجِلٌ قَائِمٌ

حَدَّثَنَا سَعِيدُ بْنُ يَحْيَى بْنِ سَعِيدٍ الْقُرَشِيُّ، قَالَ حَدَّثَنِي أَبِي قَالَ، حَدَّثَنَا ابْنُ جُرَيْجٍ، عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، نَحْوًا مِنْ قَوْلِ مُجَاهِدٍ إِذَا اخْتَلَطُوا قِيَامًا‏.‏ وَزَادَ ابْنُ عُمَرَ عَنِ النَّبِيِّ صلى الله عليه وسلم ‏‏‏.‏ "‏ وَإِنْ كَانُوا أَكْثَرَ مِنْ ذَلِكَ فَلْيُصَلُّوا قِيَامًا وَرُكْبَانًا ‏"