What is the ruling on working in the rental of wedding halls where it is known that reprehensible acts occur, such as dancing, singing, and mixing between genders, and is the money resulting from this unlawful, given that the landlord is not responsible for what happens inside the hall and only provides the place and basic furnishings?

It is forbidden to rent out wedding halls to those who commit unlawful acts therein, such as dancing, singing, music, and intermingling. This is because it falls under aiding in sin, which Allah has prohibited, saying: "And do not cooperate in sin and aggression." The rental contract would be invalid, and the money received would be unlawful, requiring repentance by spending it on charitable causes. It is incorrect to say that the rental is limited to the hall only, without providing singers and dancers, if the intended benefit of the rental is used for unlawful purposes.