The time for the intention of voluntary fasting.
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Question:
Is it obligatory to make the intention for voluntary fasting during the night?
Answer:
Answer: No, it is not obligatory. For voluntary fasting, it is permissible to make the intention during the day, on the condition that you have not eaten or drunk after the dawn has appeared. So, if you reach the daytime and have not eaten or drunk anything after the dawn, and then you intend to fast voluntarily before the sun reaches its zenith, there is no harm in that. The Prophet (peace and blessings be upon him) did this.
Is it obligatory to make the intention for voluntary fasting during the night?
Answer:
Answer: No, it is not obligatory. For voluntary fasting, it is permissible to make the intention during the day, on the condition that you have not eaten or drunk after the dawn has appeared. So, if you reach the daytime and have not eaten or drunk anything after the dawn, and then you intend to fast voluntarily before the sun reaches its zenith, there is no harm in that. The Prophet (peace and blessings be upon him) did this.
Source
www.alfawzan.af.org.sa
The Arabic text is copied verbatim from the original source, without any edits.