It wasnarrated from 'Uqbah bin 'Amir Al-Juhani that the Messenger ofAllah (ﷺ) said:
"May Allah have mercy on the one who keeps watchover the troops." (RU)
English reference (RU): Vol. 4, Book 24, Hadith 2769 (RU)
Arabic reference (RU): Book 24, Hadith 2874 (RU)