"I asked Imam (as) about a man who dedicates a property as an endowment (waqf) and then later decides to change something about it. Imam (as) said: "If he endowed it for his children or others and appointed a caretaker (qayyim) for it, then he cannot revoke it. If the beneficiaries were minors and he stipulated his guardianship over it until they reached maturity, and he maintained possession of it for them, then he cannot revoke it. However, if they were adults and he did not hand it over to them, nor did they contest him for its possession to take it from him, then he may revoke it because they had not taken possession of it despite being of age."