Answer:
(Fatwa: 945/790/B=1432)
It has been a disputed issue whether one can use interest money for public toilet and mosque toilet or not. Hence, when you used the interest money in constructing the bathroom of mosque after asking an Imam then it was allowable, and it is not necessary on you to give this amount again. However, you should spend interest amount in future on poor and needy ones.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
