In one of the European countries, there is a rented mosque, and a decision was made to demolish the it for road expansion. We have collected donations to build a new one, and some individuals have been sent to cities and other countries to collect donations to reach the required amount. Is it permissible for them to use some of the money for travel expenses and to purchase food because they are dedicated to collecting donations within a specific timeframe? Additionally, is the money collected considered an endowment if the donor intends it to be used for building the mosque? We are aware that endowments have specific rules. What is the ruling on increasing the wealth of endowments or charity funds, such as buying something and then selling it at a profit to increase the funds?