What is the Islamic ruling on a wife taking a gift from her mother deposited in a non-Islamic bank with its interest, knowing that the wife refuses to take the interest while the mother insists on it? And what is the ruling if the mother states that the gift and all its interest this year are a single gift?

It is forbidden to deposit money in usurious banks and to receive interest from them. This interest is riba (usury), which must be disposed of by spending it on Muslim welfare, such as for the poor and needy, and for building hospitals and schools. It is not permissible for the depositor to own or benefit from this interest, nor is it permissible to obey anyone in owning it, because "there is no obedience to a creature in disobedience to the Creator." Whoever insists on owning this interest has disobeyed her Lord and her husband and has incurred the warning against those who consume riba and against disobeying the husband, in accordance with the Almighty's saying: "O you who have believed, fear Allah and give up what remains [due to you] of riba, if you should be believers. And if you do not, then be informed of a war [against you] from Allah and His Messenger."