The definition of valid seclusion (khalwa sahiha) and the condition of halala
Question
What is the definition of valid seclusion (khalwa sahiha)? If a woman’s second husband, after living (with her) for a day or two in a secluded house, gave her a major (mughallaza) divorce, is it permissible for her, after the ‘idda, to marry the first husband again or not? Is valid seclusion established by their taking up a secluded house or not?
Answer
The essence of valid seclusion (khalwa sahiha) is that the man and the woman come together in such a private place where there is no impediment to conjugal relations, and also no legal (shar‘i) or natural impediment. If the first husband gives a major (mughallaza) divorce (gives three talaqs)
Source: Fatawa Mahmudiyya
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