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Question: It is known that it is forbidden to break obligatory fasting. If someone is making up for a missed day of fasting and wants to change his intention to that of a voluntary fast to be able to break it for certain reasons, would this be permissible?
Answer:
Answer:
All perfect praise be to Allah, the Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad 
is His Slave and Messenger.
is His Slave and Messenger. The Sharee‘ah has blocked the way to trickery and threatens the one who uses tricks with the severest of punishment. Regarding the Jews who resorted to trickery to catch fish on Saturday (Sabbath), Allah The Exalted Says (what means): {And you had already known about those who transgressed among you concerning the Sabbath, and We said to them, "Be apes, despised."}[Quran 2: 65]
What is mentioned in the question is nothing less than breaking and nullifying an obligatory fast. Scholars have unanimously agreed that the person who starts performing an obligatory act of worship is not permitted to break it without a Sharee‘ah-approved excuse. Allah The Exalted Says (what means): {….And do not invalidate your deeds.}[Quran 47: 33]
Consequently, if that person who wants to change his intention from obligatory to voluntary fasting has a Sharee‘ah-approved excuse such as illness or the like, he can break his obligatory fasting and there will be no need for the trickery. But if it happens to be an invalid excuse, then this will not allow him to change his intention from obligatory to voluntary fasting to break his voluntary fasting.
Allah Knows best.
