Marriage Before Repenting For Fornication
Who will invalidate that marriage? For a marriage to be invalidated, there needs to be an intervention from State which is not possible unless state convicts someone of fornication. In its absence, the matter rests between the preson and the God. He should repent before marriage but if he failed or did it later at some point, then final decision rests with God. We neither have any authority nor any evidence to intervene in that marriage.