What is the ruling on subscribing to the health insurance of the Jordanian Engineers' Association? Knowing that the insurance is based on the principle of mutual cooperation as mentioned in the introduction of the insurance booklet, I do not know if they invest the funds they receive, and if they do, I am not aware of the type of investment nor do I know if they deal with usurious banks, as I have not reached any of this information after searching. What is the ruling on subscribing to the pension fund of the Engineers' Association?