“I once asked abu al-Hassan (a.s.), saying, ‘I pray to Allah to keep my soul in service for your cause, I have bought a land near by my assets for two thousand dirham. When I made payment, I was informed that the land is an endowment.’ He (the Imam) said, ‘Buying an endowment is not permissible. You must not include its income in your assets. Give it back to its beneficiaries.’ I then said, ‘I do not know the beneficiaries.’ He (the Imam) said, ‘Give its income in charity.’”