Lending and borrowing from the masjid.

1. Borrowing property belonging to a masjid is ḥarām, regardless of whether permission is granted by the masjid committee. This ruling also applies to lending a masjid's property to another masjid. In al-Fatāwā al-Fiqhiyyah al-Kubrā, Imām Ibn Ḥajar al-Haytamī was asked about borrowing loose carpets from a masjid for a wedding or similar occasion. He replied:

ولا يجوز استعمال حصر المسجد ولا فراشه في غير مسجده، سواء أكان لحاجة أم لا، واستعمالها في الأعراس من أقبح المنكرات التي يجب على كل أحد إنكارها، وقد شدد العلماء النكير على من يفرشها بالأعراس والأفراح، وقالوا: يحرم فرشها ولو في مسجد آخر. (الفتاوى الفقهية الكبرى ٢٨٨/٣)

It is not permissible to use the mats or furnishings of a masjid for any purpose outside the masjid to which they belong, whether there is a need or not. Using them for weddings or other private functions is among the most reprehensible of wrongful acts, and it is obligatory upon everyone to denounce such practices. The scholars strongly condemned those who use the masjid's mats and furnishings at weddings and other celebrations, stating that it is unlawful to use them even in another masjid.

2. This is because once an asset has been dedicated as waqf or donated to a waqf, it ceases to be the property of any individual. Its use is thereafter restricted to the purpose for which it was endowed.

3. The general intended purpose of property belonging to a masjid, unless otherwise stipulated by the endower, is that it be used for the benefit of the general public rather than any specific individual or family, and only within the premises of the masjid for which it was endowed.