During the early Muslim conquests of 622–750, Muslims routinely captured large numbers of prisoners. Aside from those who converted, most were ransomed or enslaved. Christians captured during the Crusades were usually either killed or sold into slavery if they could not pay a ransom. During his lifetime (-632), Muhammad made it the responsibility of the Islamic government to provide food and clothing, on a reasonable basis, to captives, regardless of their religion; however if the prisoners were in the custody of a person, then the responsibility was on the individual. The freeing of prisoners was highly recommended as a charitable act.