Except for those who repent after this (false blaming) and mend their ways. Then Allah is verily Most Forgiving, Ever-Merciful. (They will not be counted amongst the disobedient, but this will not exempt them from hadd al-qadhaf [the penalty for false accusation of adultery].
Except those who repent and correct themselves... Indeed, Allah is the Ghafur, the Rahim.
Sayyed Abbas Sadr-Ameli
Save those who repent thereafter and make amends, for verily Allah is Forgiving, Merciful
Al-muntakhab fi tafsir al-Qur'an al-Karim
Exempt from this condemnation are those who in lowliest plight repentant stood and imprinted their deeds with wisdom and piety. They shall find Allah Ghafurun (Forgiving), Rahimun (Merciful) indeed
And those who accuse chaste women then do not bring four witnesses, flog them (with) eighty stripes and do not accept their testimony forever, and those are the persons who exceed the limits,