Adam Clarke on 2 Kings 6:22

Whom thou hast taken captive - Those who in open battle either lay down their arms, or are surrounded, and have their retreat cut off, are entitled to their lives, much more those who are thus providentially put into thy hand, without having been in actual hostility against thee. Give them meat and drink, and send them home to their master, and let them thus know that thou fearest him not, and art incapable of doing an ungenerous or unmanly action.