The two who commit it from amongst you, then you shall reprimand them. If they repent and amend, then leave them alone. God is Redeemer, Compassionate.
Translation endnotes
[4:16] The relative pronoun is not marked; the male dual form allazani (both) includes the female partner. In this case, it appears that the illegal or extramarital sexual affair is monogamous. For the punishment of the adulterers, see 24:1.