Is it considered a sin to write a letter for a non-Arab person enabling him to buy alcohol, if the writer is the only Arab in an oil company that does not trade in alcohol, knowing that the writer believes his work is not in a cursed alcohol company?

"Means take the rulings of their ends." Writing the aforementioned letter is a cause for obtaining alcohol and a means for its existence. This act constitutes cooperation in sin and aggression, which is forbidden in His (the Most High's) saying: "And do not cooperate in sin and aggression."

The Messenger of Allah (peace and blessings be upon him) cursed ten individuals regarding alcohol, among whom were those who were instrumental in its acquisition, such as the carrier and the buyer. Therefore, writing this letter is impermissible due to its aiding in the procurement of this reprehensible item.