Khalid bin Ma'dan خالد بن معدان · The Book on Military Expeditions

That on the day of Conquest of Makkah, the Messenger of Allah (ﷺ) said: "There is no Hijrah after the conquest, there is only Jihad and intention, and when you are called to go forth (for battle), then go." There are narrations on this topic from Abu Sa'eed, 'Abdullah bin 'Amr, and 'Abdullah bin Hubshi. This Hadith is Hasan Sahih. Sufyan Ath-Thawri reported it similarly from Mansur bin Al-Mu'tamir.

From his father who said: "When the Messenger of Allah (sawS) sent a commander of an army, he would exhort him concerning himself to have Taqwa of Allah, and he would exhort him to be good to those who are with him among the Muslims. He would say: 'Fight in the Name of Allah, in the cause of Allah. Fight those who disbelieve in Allah, and do not steal from the spoils of war or be treacherous, nor mutilate, and…