Calculating the Fasting of Two Consecutive Months by the Lunar Calendars
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Question:
Honorable Shaykh, is it valid to fast two months, for example, the month of Muharram and the month of Safar, or if one starts from the fifteenth of Muharram to the fifteenth of Safar to the fifteenth of Rabi' al-Awwal? Is that valid?
Answer:
Fasting two months is of two types: either by the lunar calendars or by the number of days. It is not done by the lunar calendars unless he sees the crescent moon. If he sees the crescent and starts from there, he is required to continue until he completes the second crescent, the crescent of the second month. However, if he does not see the crescent, he is required to fast by the number of days, sixty days. It is by the number of days, sixty days. Yes.
Honorable Shaykh, is it valid to fast two months, for example, the month of Muharram and the month of Safar, or if one starts from the fifteenth of Muharram to the fifteenth of Safar to the fifteenth of Rabi' al-Awwal? Is that valid?
Answer:
Fasting two months is of two types: either by the lunar calendars or by the number of days. It is not done by the lunar calendars unless he sees the crescent moon. If he sees the crescent and starts from there, he is required to continue until he completes the second crescent, the crescent of the second month. However, if he does not see the crescent, he is required to fast by the number of days, sixty days. It is by the number of days, sixty days. Yes.
Source
شرح بلوغ المرام من أدلة الأحكام [ صالح الفوزان ]، باب الرجعة، وباب الإيلاء والظهار والكفارة — islamhouse.com (1:14:37)
The Arabic text is a machine transcription of the audio recording.