Who is required to fast sixty consecutive days, and if it is obligatory for a woman, how can she fast sixty consecutive days despite her menstruation, and what are the rulings that necessitate this expiation?

Fasting for two consecutive months is obligatory in three cases:

1. Accidental Killing: If one accidentally kills a believer and cannot find a believing slave to free, then he must fast for two consecutive months, as stated in the Almighty's saying: (But whoever finds none, then a fast for two consecutive months, as a penance from Allah). 2. Dhihar (Abusive Resemblance of Wife to Unlawful Kin): If one declares dhihar against his wife and cannot find a slave to free, then he must fast for two consecutive months, due to the Almighty's saying: (But whoever finds none, then a fast for two consecutive months). 3. Intercourse during Ramadan Daytime: If one has intercourse with his wife during the daytime in Ramadan and is unable to free a slave, then he must fast for two consecutive months.

Whoever is obligated to fast for two consecutive months should not interrupt it except for a legitimate Shar'i excuse, such as illness, insanity, or menstruation. If he interrupts it without a legitimate Shar'i excuse, he must start anew. If he interrupts it for a legitimate Shar'i excuse, he continues fasting after the excuse is gone and builds upon what he had already fasted before the excuse. A woman who is obligated to fast for two months and then menstruates should complete her fasting after her menstruation ends. There is no expiation (kaffarah) on a woman for intercourse during Ramadan daytime, nor is dhihar applicable to her, by scholarly consensus.