What is the ruling on marrying my sister to my cousin and marrying my cousin's daughter without a mahr?
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Question:
Your Eminence! I do not possess any money, and the mahr in our area is expensive; so I resorted to barter, meaning: I gave my sister to my cousin, and I took my cousin's daughter in exchange for my sister. What is the ruling on this? May Allah reward you with good.
Answer:
This is not permissible. This is called nika' al-shighar. If there is an agreement between you where you give him your sister and he gives you his sister, this is not permissible. The Messenger of Allah (peace and blessings be upon him) prohibited this in several authentic hadiths. However, if you propose a girl and he proposes a girl without an agreement, by mutual consent, there is nothing wrong with it. But if you say, "Marry me and I will marry you," this is not permissible, neither with the daughter, nor with the sister, nor with the sister's daughter. Yes.
The presenter: May Allah reward you with good.
Your Eminence! I do not possess any money, and the mahr in our area is expensive; so I resorted to barter, meaning: I gave my sister to my cousin, and I took my cousin's daughter in exchange for my sister. What is the ruling on this? May Allah reward you with good.
Answer:
This is not permissible. This is called nika' al-shighar. If there is an agreement between you where you give him your sister and he gives you his sister, this is not permissible. The Messenger of Allah (peace and blessings be upon him) prohibited this in several authentic hadiths. However, if you propose a girl and he proposes a girl without an agreement, by mutual consent, there is nothing wrong with it. But if you say, "Marry me and I will marry you," this is not permissible, neither with the daughter, nor with the sister, nor with the sister's daughter. Yes.
The presenter: May Allah reward you with good.
Source
binbaz.org.sa
The Arabic text is copied verbatim from the original source, without any edits.