A man who obligates himself to fast for a month

Al-Hasan said concerning a man who made a month's fasting binding upon himself: If he named a specific month, let him fast it and fast it consecutively. If he did not name a specific month, or did not intend one, let him count the days and fast thirty days. If he began fasting upon (sighting) the new moon and ended his fast upon sighting it (again), and it came to twenty-nine days, that suffices him. And (it is valid) even if he fasts them separately, when he counts the days.

Abu Qilabah said: If a man says, "A month's fasting is upon me," he knows best what he made binding, and his intention is what counts (it will be taken according to his intention).

Ata and Ibrahim said: If a man vows, "A month's fasting is upon me," and does not specify any particular month among the months, then if he wishes he may fast consecutively, and if he wishes he may fast on separate days.

And it is also narrated from Ibrahim (through Hammad); they both (Ata and Ibrahim) said: When a man makes a month's fasting binding upon himself and does not name any particular month, then if he wishes he may fast consecutively, and if he wishes he may fast separately.

Maymun said: If the vow is one of fasting, the fasts are to be kept consecutively.

Hajjaj said: I asked Ata, and someone who had asked Ibrahim told me, about a man who vows, "A month's fasting is upon me." They both said: He shall fast thirty days, meaning separately (keeping them consecutively is not required).