English Translation
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 said, 'If the number of the enemy is greater than the Muslims, they can pray while standing or riding (individually).' "
This hadith is from Sahih al-Bukhari, the most rigorously authenticated collection in Islamic scholarship. No editorial opinion is added.