What is the origin of the idiom "one's wish is one's command" and when to use it?

The idiom "one's wish is one's command" originates from a common theme found in various cultures and literature, signifying that those with the power to fulfill wishes do so obediently and promptly. It reflects a recurring theme of granting wishes as a form of service or obedience in folklore and legends. This expression is now often used to convey eagerness and obedience in fulfilling another's wishes or requests.