ANSWER:

This is a vow and vows are not recommended in islam as one is obliging himself to do something Allah didn’t mandate upon him.

My newborn baby has fever. Is it permissible to have a niyyah to fast when my baby is recovered ??

Oaths | March 20, 2019 10:06 am
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Can a muslim vow and say oh Allah if u do my job I shall fast for so many days. If we had already vowed and Allah bless us , should we keep that fast? Pls guide , may Allah help u in all ur works.
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Is it permissible to make Dua and say that If Allah fulfiled my Dua I will pray 100 nawafil or keep fast for 10 days or give money to needy?