The Book of Jihad and Expeditions

Sahih Muslim

Fight in the name of Allah and in the way of Allah. Fight against those who disbelieve in Allah. Make a holy war, do not embezzle the spoils; do not break your pledge; and do not mutilate (the dead) bodies;...

Sahih Muslim

Sulaiman b. Buraida repotted on the authority of his father that when Allah's Messenger (ﷺ) sent an Amir with a detachment he called him and advised him. The rest of the hadith is the same.