Muhammad bin Maymun, Abu Hamza محمد بن ميمون المروزي أبو حمزة السكري · The Chapters on Jihad

“I heard the Prophet (ﷺ) say: ‘There is no band of warriors that fights in the cause of Allah and acquires war spoils, but they have been given two thirds of their reward, but if they do not get any spoils of war, then they will have their reward in full (in the Hereafter).’”

“A slave came and gave his pledge to the Prophet (ﷺ), pledging to emigrate, and the Prophet (ﷺ) did not realize that he was a slave. Then his master came looking for him, and the Prophet (ﷺ) said: ‘Sell him to me,’ and he brought him in exchange for two black slaves. Then after that he did not accept the pledge from anyone until he had asked whether he was a slave.”