Is the salary allocated for the six days spent reviewing the accounts of a company that sells alcohol considered unlawful (haram) or lawful (halal) money, bearing in mind that the salary is paid by the accounting firm and not by the alcohol-selling company?

It is not permissible to work in auditing the accounts of liquor companies; for leasing oneself for such work is forbidden, and its earnings are not lawful, as the Prophet, peace and blessings be upon him, said: "Indeed, when Allah forbids something to a people, He also forbids its price to them." This work is considered aiding in sin and aggression, and it involves condoning evil. The earnings acquired from this work must be disposed of by spending them in charitable causes, and one must repent to Allah, and refrain from participating in similar work in the future.