Is it permissible for those in charge of the mosque to rent out a house for Qur'an memorization – which was built from perpetual charities to serve the Qur'an and the poor at a symbolic fee – for large sums that the poor cannot afford, under the pretext that its income will be spent on the mosque and dawah affairs, and is the donor sinful if he leaves them to do that while being able to prevent them?

The condition set by the endower must be adhered to unless it contravenes Islamic law, because "the text of the endower is like the text of the Lawgiver." Therefore, it is not permissible to disable a house endowed for memorizing the Quran and rent it out for other purposes, such as renovating the mosque or for da'wah activities. Rather, it must be utilized for the purpose for which it was endowed. If it was endowed for free education and memorization, it is not permissible to convert it into a rental property unless there is a dire need for renovation and no one is available to undertake it. In such a case, it is permissible to collect small fees or rent out a portion of it solely for its maintenance, not for spending on other projects. Whoever violates the valid condition of the endower without necessity is considered an aggressor and a sinner, and must be prevented.