"O you who believe! Obey Allah and obey the Messenger (Muhammad). That he said: This was revealed concerning 'Abdullah bin Hudhaifah bin Qais bin 'Adiyy, whom the Messenger of Allah appointed in charge of an expedition"
Sunan an-Nasa'i Book 39, Hadith 46
← Previous Hadith "The Messenger of Allah said: 'Whoever obeys me, obeys Allah, and whoever disobeys me, disobeys Allah. Whoever obeys my governor (Amir), he has obeyed me, and whoever disobeys my governor, he has disobeyed me."'

Sunan an-Nasa'i Book 39, Hadith 45 Next Hadith → "Military campaigns are of two types: as for the one who seeks the Face of Allah, obeys the imam, spends what is precious and avoids mischief, whether he is asleep or awake, he is earning reward. But as for the one who fights in order to show off and gain a reputation, and disobeys the imam and spreads mischief in the land, he comes back empty-handed." (Da 'if)

Sunan an-Nasa'i Book 39, Hadith 47