When making up missed fasts, it is essential to form the intention the night before, as is required in the case of the original fast

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I wasnt aware that ramadan fasts missed due to menstruation had to be made up before nafl ones and I started keeping some nafl ones so is it possible for me to change the intention of the previous nafl ones I have kept or to change the intention of fast during the day? Because the one I kept today for example I started off with the intention of keeping a nafl fast but can I now change this to the intention of making up the ones I missed in ramadan?

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Praise be to Allah.


It is not valid to change the intention of observing the voluntary fast that one has completed in order to make it a fast to make up for a day of Ramadan which one did not fast, because when making up missed fasts, it is essential to form the intention the night before, because making up missed fasts comes under the same ruling as the original fast. The Prophet (blessings and peace of Allah be upon him) said: “Whoever does not intend to fast before dawn, his fast does not count.” Narrated by at-Tirmidhi, 730; classed as saheeh by al-Albaani in Saheeh at-Tirmidhi. At-Tirmidhi said after quoting it: What is meant, according to the scholars, is that the fast does not count for the one who did not form the intention to fast before dawn broke in Ramadan or when making up a missed Ramadan fast or when fasting in fulfilment of a vow. If he did not form the intention to fast from the night before, then it does not count. As for voluntary fasts, it is permissible for him to form the intention after dawn breaks. This is the view of ash-Shaafa‘i, Ahmad and Ishaaq. End quote. 

an-Nawawi (may Allah have mercy on him) said: 

A Ramadan fast or making up a fast or an expiatory fast or a fast offered as fidyat al-Hajj (compensation for mistakes in Hajj) or other obligatory fasts are not valid if the intention is made during the day. There is no difference of opinion on this matter.

End quote from al-Majmoo‘, 6/289 

See: al-Mughni by Ibn Qudaamah, 3/26 

That is because changing the intention after finishing an act of worship does not have any impact. 

As-Suyooti (may Allah have mercy on him) said in al-Ashbaah wa’n-Nazaa’ir, p. 37: 

If a person intends to end his prayer after completing it, that does not render it invalid, according to scholarly consensus. The same applies to all other acts of worship. End quote. 

So the fast that was done with the intention of observing a voluntary fast cannot count as a fast observed to make up for (a missed obligatory fast). 

And because if he started observing it as a voluntary fast, then he decided during the day to change it into a fast observed to make up for (a missed obligatory fast), then he would have fasted part of that obligatory day on the basis that it was voluntary, so it cannot make up for an obligatory fast, because actions are but by intentions, and he fasted part of the day with the intention of it being voluntary. 

And because he changed the intention from a general fast to a specific fast, and that is not valid. 

And Allah knows best. 

For more information, see the answer to question no. 39689 

But we should point out to you that observing naafil fasts is not disallowed for the one who still has to make up Ramadan fasts, as mentioned in the question. Rather the correct opinion is that if a person wants to observe a voluntary fast when he owes an obligatory fast, such as making up missed days from Ramadan and the like, his fast is valid so long as he still has enough time to make up what he owes before the next Ramadan begins. But what is not allowed is to fast the six days of Shawwaal before making up what he owes from Ramadan. However this is a matter concerning which the scholars differed. 

See also the answer to questions no. 41901 and 39328.

Whatever written of Truth and benefit is only due to Allah's Assistance and Guidance, and whatever of error is of me. Allah Alone Knows Best and He is the Only Source of Strength.

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