The ruling on fasting for expiation by number or by the lunar month
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Question:
He said: Regarding your previous question about fasting for expiation, is it considered a lunar month or thirty days?
Answer:
It is by number, unless the moon is established. If it is established by clear evidence, as may happen in the months around Ramadan, between Ramadan and Dhu al-Hijjah, it may be established by testimony and that is sufficient. Otherwise, the default is thirty days. Yes.
He said: Regarding your previous question about fasting for expiation, is it considered a lunar month or thirty days?
Answer:
It is by number, unless the moon is established. If it is established by clear evidence, as may happen in the months around Ramadan, between Ramadan and Dhu al-Hijjah, it may be established by testimony and that is sufficient. Otherwise, the default is thirty days. Yes.
Source
التعليق على بعض أحاديث مسند أحمد، تابع شرح مسند ابن عباس، من أول حديث: نهى رسول الله صلى الله عليه وسلم عن مهر البغي وثمن الكلب وثمن الخمر — islamhouse.com (15:05)
The Arabic text is a machine transcription of the audio recording.