Is the wife's sister forbidden to her sister's husband, and is he considered a mahram (a relative one may not marry) to her?
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Question:
The questioner from Yemen says: Is my wife's sister a mahram to me or not? And what is the interpretation of the noble verse[An-Nisa 4:23]?
Answer:
Yes, your wife's sister is forbidden to you with a temporary prohibition. As long as her sister is with you, she is forbidden to you. Allah the Exalted said:[An-Nisa 4:23] But you are not a mahram to her. She is forbidden to you, but you are not a mahram to her, because this prohibition is not permanent. A mahram is one whose prohibition is permanent, such as the husband's father or the husband's son; this is a permanent prohibition. As for the wife's sister, her prohibition is temporary. If he divorces her sister or if she dies, it is permissible for him to marry her, so he is not a mahram to her. Yes.
The questioner from Yemen says: Is my wife's sister a mahram to me or not? And what is the interpretation of the noble verse
and that you take [in marriage] two sisters simultaneously, except for what has already occurred
وَأَن تَجْمَعُوا بَيْنَ الْأُخْتَيْنِ إِلَّا مَا قَدْ سَلَفَAnswer:
Yes, your wife's sister is forbidden to you with a temporary prohibition. As long as her sister is with you, she is forbidden to you. Allah the Exalted said:
and that you take [in marriage] two sisters simultaneously
وَأَن تَجْمَعُوا بَيْنَ الْأُخْتَيْنِ
Source
قناة «العلامة الدكتور صالح الفوزان»، 5999- هل أخت الزوجة تحرم على زوج أختها وهل يعتبر محرماً لها؟ - الشيخ صالح الفوزان — youtube.com
The Arabic text is a machine transcription of the audio recording.