Yes, it is absolutely haram (forbidden) in Islam to marry your sister.
Islam strictly prohibits marriage between close relatives, including siblings. This prohibition is explicitly stated in the Quran and is a fundamental principle of Islamic law. Marrying one's sister is considered incestuous and a grave sin in Islam.
Here's why:
- Quranic Prohibition: The Quran clearly outlines the prohibited degrees of kinship for marriage, which includes one's siblings.
- Sanctity of Family Relationships: Islam emphasizes the importance and sanctity of family ties. Marrying a sibling would violate these established bonds and lead to significant social and moral problems.
- Moral and Ethical Considerations: Incestuous relationships are considered morally reprehensible and harmful to the individuals involved, as well as to the broader community.
- Religious Scholars Consensus: There is unanimous agreement (ijma) among Islamic scholars across all schools of thought that marrying a sibling is unequivocally forbidden.
Therefore, based on the Quran, the Sunnah (teachings and practices of Prophet Muhammad), and the consensus of Islamic scholars, marrying your sister is strictly forbidden in Islam.
