Is it permissible to spend collected donations for establishing water lines for the poor on another charitable project, such as a waqf (endowment) or sadaqah jariyah (ongoing charity), if the required amount for the original task is not met and the donors cannot be informed because their contact information has been lost?
As long as the donations were made for a specific purpose, they may not be spent on anything else. However, if that is not possible and the donor cannot be informed, then there is no harm in spending them on other matters that benefit the poor.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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