Is it permissible, Islamically, for a man to conceal his second marriage from his first wife, or does she have the right to know before the marriage, especially since the validity of the contract is conditioned upon acceptance and announcement (ishhar), and announcement here includes informing the first wife?
The correct view is that publicizing the marriage (ishhar an-nikah) is recommended, not obligatory, according to the majority of scholars. It is not a condition of publicizing that everyone be informed. Therefore, the validity of a man's marriage does not depend on informing his first wife or anyone else.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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