Answer:
(Fatwa: 1196/1196/M=1431)
If husband and wife established extramarital relation, it will not have negative effect on the validity of their nikah. Their nikah will remain intact. However, according to Islam, it is haram and unlawful and severe sin to have illegal physical relation. There is stern penal code if the adultery is proved. It is necessary to do tauba and istighfar with sincerity so that the sin is purged away.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
