Q: Is it permissible for my father
to perform `Umrah (lesser pilgrimage) with money that he borrowed from a bank
It is obligatory upon whoever wants to perform Hajj or `Umrah for themselves or on behalf of others to perform Hajj or `Umrah with lawful money as Allah (Glorified and Exalted be He) only accepts acts of worship performed with money obtained by lawful means.As for borrowing money from banks and others with an interest, it is not permissible at all as it is a practice of Riba (usury/interest). The Prophet (peace be upon him) cursed the one who gives Riba, the one who takes Riba, the one who writes down a usurious transaction and those who witness the transaction, and he (peace be upon him) said:
They all are equal in sin.
The Ill-gotten money is a reason for Allah to reject supplications and not accept acts of worship. If this money is borrowed with no interest, there is nothing wrong with performing Hajj or `Umrah with it.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.