What is the ruling on fulfilling a vow (Nadhr) to fast consecutive months if the fasting begins in the middle of a lunar month?

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If one begins consecutive fasting months from the beginning of a lunar month, the fulfillment is counted by the appearance of the new moons (Ahillah), and this is without scholarly disagreement. If the fasting begins in the middle of a month, that initial month is completed by counting the days, and the remaining full months are counted by the lunar cycle. This view is held by Malik, Shafi'i, and one narration from Abu Hanifa.