What is the ruling on contributing to the construction of a wedding hall (lounge) by supplying them with building materials, knowing that some of the celebrations held therein do not adhere to the provisions of Sharia and include Sharia violations?

The ruling on contributing to the establishment and construction of wedding halls depends on who will use them. If it is known that the owner will not rent them out to those who disobey Allah therein, then their construction and contribution to them are permissible. However, if it is known that he will rent them out to those who disobey Allah therein (through mixing of genders, prohibited music, or similar acts), then their construction and contribution to them are forbidden, based on the Almighty's saying: (And cooperate in righteousness and piety, but do not cooperate in sin and aggression).

If the owner will rent them out to those who observe Islamic law and to those who do not, then the ruling is based on the predominant usage: If the forbidden usage is more prevalent, construction is forbidden. If the permissible usage is more prevalent, construction is permissible, and the sin of the forbidden usage falls upon the renter and the disobedient person. If both usages are equal, construction is forbidden, prioritizing the aspect of prohibition.

This is determined based on the customs of the people of the country and the situation of the owner. In the lands of the Two Holy Mosques, it appears that the permissible use of these halls is predominant; therefore, there is no harm in constructing them.