Jihad (Kitab Al-Jihad)
Dawud :: Book 14 : Hadith 2554
Narrated Samurah ibn Jundub:
The Prophet (peace_be_upon_him) named our cavalry "the Cavalry of Allah," when we were struck with panic, and when panic overtook us, the Apostle of Allah (peace_be_upon_him) commanded us to be united, to have patience and perseverance; and to be so when we fought.