What is the ruling on taking wages for two days of work in building something designated for drinking alcohol?

It is impermissible to work in building something that will be used for sin, such as a building where alcohol is consumed, because it constitutes aiding in sin, based on the Almighty’s saying: ﴿And cooperate in righteousness and piety, but do not cooperate in sin and aggression﴾.

The jurists differed on the ruling concerning the wage for forbidden work; the well-known opinion is that it is not permissible due to the invalidity of the hiring contract. Imam Ahmad, however, held that the contract is valid, but the wage is not lawful for the worker, and he must donate it as charity.

If the worker was unaware of the hirer’s purpose or of the prohibition of his work, then the wage is permissible for him, and he is not obliged to dispose of it, based on the Almighty’s saying: ﴿So whoever receives an admonition from his Lord and desists, he may have what has already passed, and his affair is left to Allah﴾.