1. It is not permissible to make lost property announcements in the mosques or to make announcements about items that have been found. 2. Whoever wants to make a lost property announcement, let him go outside the mosque, and if he writes on a piece of paper and sticks it on the outside wall of the mosque. 3. If the advertisement has to do with an act of worship, there is nothing wrong with it. But if the advertisement has to do with worldly matters, then it is prohibited.