Is it permissible to vow to donate a sum of money to the poor and needy upon getting engaged to a specific person? And is it permissible to donate half of the sum to a mosque instead of the poor, considering it as an ongoing charity (Sadaqah Jariyah)? And is it permissible to consider this donation as expiation for a previous sin, whether major or minor? And is it valid to combine the vow and the expiation of sin with this amount, in accordance with the Prophetic Hadith "Charity extinguishes sin"?
The vow must be given to the poor and the needy, and it is not permissible to give it to the mosque, because the one who made the vow specified its disbursement to the poor. This vow does not suffice for the obligatory expiation; rather, the expiation must be paid with other money if the sin requires expiation. It is also prescribed to give charity for sins that have no expiation, along with repentance.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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