A man who commits adultery with his wife's sister: what is his wife's status with him?

Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: One who commits zina with his wife's sister has committed a grave sin, but his wife does not become unlawful for him.

Al-Zuhri said: If a man commits zina with his wife's sister (his sister-in-law), his wife does not become unlawful for him, because something unlawful cannot make something lawful unlawful.

Ibn Ashwa' was asked about this, and he said: Something unlawful cannot make something lawful unlawful. I have dared to say this, whereas Ibrahim and al-Sha'bi were afraid to say it.

Al-Hasan said: In this case his wife becomes unlawful for him.

Qatadah said: In the case of zina with the wife's sister, the wife does not become unlawful; however, he may not have intercourse with his wife until the woman with whom he had intercourse has completed her waiting period ('iddah).

Jabir bin Zayd and al-Hasan said: In the case of zina with the wife's sister, the wife becomes unlawful.

Sa'id said: Qatadah said: That does not make her unlawful for him; however, he may not approach his wife until the waiting period of the woman with whom he committed the sin is over.

Al-Nakha'i also held the same view as Qatadah: the sister-in-law with whom zina was committed is to observe a waiting period, and that waiting period may last until she gives birth.

Ata said: Committing zina with the wife's sister does not make the wife unlawful.

Al-Sha'bi said: Committing zina with the wife's sister does not make the wife unlawful.

Sayyiduna Imran bin Husayn (may Allah be pleased with him) said: By committing zina with the wife's sister, the wife becomes unlawful.

Sayyiduna Ibn Abbas (may Allah be pleased with them both) said: By committing zina with his wife's sister, a man's wife does not become unlawful for him.