A man has donated part of his wealth for the upkeep of the mosque. He now wishes to put up a promotional sign on the walls of the mosque to advertise his business. What is the ruling of Islamic law on this?

First, mosques are the houses of Allah Almighty; they must therefore be kept free from anything that might undermine sincere worship of Allah offered in the mosque.

Second, since the time of the Prophet (peace and blessings be upon him) until the present day, we have not read or heard of mosques being used for commercial promotion.

Third, we ask Allah to bless the man who has donated part of his wealth to the mosque with success in his business in return. We also advise him not to put up advertisements on the mosque walls promoting his business, as this goes against sincerity of intention for Allah, the Lord of all worlds.

And Allah Almighty knows best.