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." (DE)
English reference (DE): Vol. 4, Book 24, Hadith 2769 (DE)
Arabic reference (DE): Book 24, Hadith 2874 (DE)