Quran 24:2 — Light (Al-Noor)

The adulteress and the adulterer you shall whip each of them a hundred lashes. Do not be swayed by pity from carrying out GOD's law, if you truly believe in GOD and the Last Day. And let a group of believers witness their penalty.*

[24:1] A sura that we have sent down, and we have decreed as law. We have revealed in it clear revelations, that you may take heed.

[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.