Is it permissible to benefit from prizes offered by a savings account in an Islamic bank, given that these prizes are not derived from Mudarabah but from funds specifically allocated for that purpose?

Depositing money into a savings account with an Islamic bank for investment, where the account holder receives a share of the profit, is considered Mudarabah (profit-sharing) and is subject to its rulings. The opinion that permits the bank to withdraw from these funds and include them in a lottery for promotional prizes is the most prominent, provided that these prizes are paid from the bank's own funds and not from the profits of the investment accounts.