Quran 4:15 — Women (Al-Nesa')

Those who commit adultery among your women, you must have four witnesses against them, from among you. If they do bear witness, then you shall keep such women in their homes until they die, or until GOD creates an exit for them.*

[4:14] As for the one who disobeys GOD and His messenger, and transgresses His laws, He will admit him into Hell, wherein he abides forever. He has incurred a shameful retribution.

[4:16] The couple who commits adultery shall be punished.* If they repent and reform, you shall leave them alone. GOD is Redeemer, Most Merciful.