Mishkat al-Masabih 3930

‘Abdallah b. Abu Aufa told that at one of his battles in which God’s Messenger met the enemy he waited till the sun declined, then stood up among the people and said, “You people must not desire to meet the enemy, but must ask God for wellbeing, and when you meet them show endurance and know that paradise is under the shadows of the swords." He then said, “O God, who sendest down the Book, makest the clouds to travel and routest the confederates, rout them and give us victory over them.” (Bukhari and Muslim.)