Is the use of usurious interest found in the wife's accounts, which was fully withdrawn and given to the brother for his marriage, with the intention of getting rid of usury without seeking reward, a correct and permissible act in Sharia, and what should be done to expiate the sin if it is not?

Money acquired from usury is disposed of by giving it to the poor and the needy, or by spending it on general public interests for Muslims, such as building schools, orphanages, and paving roads. If the questioner's brother is poor, then what his wife did is permissible. If he is not poor, then she must donate the amount of the usurious interest to the aforementioned channels.