فَإِن عُثِرَ عَلىٰ أَنَّهُمَا استَحَقّا إِثمًا فَآخَرانِ يَقومانِ مَقامَهُما مِنَ الَّذينَ استَحَقَّ عَلَيهِمُ الأَولَيانِ فَيُقسِمانِ بِاللَّهِ لَشَهادَتُنا أَحَقُّ مِن شَهادَتِهِما وَمَا اعتَدَينا إِنّا إِذًا لَمِنَ الظّالِمينَ

If it becomes apparent that the two witnesses are guilty of sin, replace them with two others who have a rightful claim. And have them swear by God, stating, “Our testimony is truer than theirs, and we won’t be biased, for then we would be unjust.”