Is it permissible to voluntarily subscribe to the employees' Takaful fund for one month, knowing that a sum of 7650 dinars will be obtained in exchange for paying 30 dinars, while those who subscribe for a longer period receive a smaller amount?

A tawaful (mutual guarantee) fund based on donations is permissible in principle. However, the intention to leave work one month after paying the subscription is considered deception towards the fund's members. It is not permissible to proceed with this unless the fund adheres to Islamic Sharia principles, and the responsible authority has been informed of the intention to leave work.