Is it permissible to benefit from bank interest for the treatment of one's parents or to donate it for building a mosque?

If the profits are from an Islamic bank, then there is no harm in benefiting from them for oneself, for others, for public interests, and for charitable works such as building mosques.

However, if the profits are from usurious banks, they are forbidden money, and it is not permissible to benefit from them for treating parents or others, or for private interests. Rather, one must dispose of them by spending them on public interests and charitable endeavors, such as building mosques.