What is the ruling on one who vows to fast for the rest of his life?
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Question:
The questioner asks: What is the ruling on one who vows to fast for the rest of his life?
Answer:
It is not permissible to vow to fast for the rest of one's life. That is, to never break the fast; this is not permissible. This is not prescribed. However, if one vows to fast for the rest of his life, meaning he vows to fast most of the days, or mostly fasts and breaks the fast, there is no harm in that. This is good. The Messenger of Allah (peace and blessings be upon him) used to fast and break the fast. As for fasting constantly, Allah (Glorified and Exalted is He) has not prescribed that, and such a vow is not valid. Yes.
The questioner asks: What is the ruling on one who vows to fast for the rest of his life?
Answer:
It is not permissible to vow to fast for the rest of one's life. That is, to never break the fast; this is not permissible. This is not prescribed. However, if one vows to fast for the rest of his life, meaning he vows to fast most of the days, or mostly fasts and breaks the fast, there is no harm in that. This is good. The Messenger of Allah (peace and blessings be upon him) used to fast and break the fast. As for fasting constantly, Allah (Glorified and Exalted is He) has not prescribed that, and such a vow is not valid. Yes.
Source
قناة «العلامة الدكتور صالح الفوزان»، ما الحكم فيمن نذر صيام الدهر؟ #فتاوى الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.