Answer:
(Fatwa: 958/958=M/1430)
It is unlawful to use water and electricity illegally in mosques. Theft is sinful act whether committed in mosque or outside, rather committing theft in a holy place like mosque is more heinous.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
