Quran 24:4 — Light (Al-Noor)

Those who accuse married women of adultery, then fail to produce four witnesses, you shall whip them eighty lashes, and do not accept any testimony from them; they are wicked.

[24:3] The adulterer will end up marrying an adulteress or an idol worshiper, and the adulteress will end up marrying an adulterer or an idol worshiper. This is prohibited for the believers.

[24:5] If they repent afterwards and reform, then GOD is Forgiver, Merciful.