But if it is found that those two were guilty of perjury, (5:107)

﴿فَإِنْ عُثِرَ عَلَىٰ أَنَّهُمَا اسْتَحَقَّا إِثْمًا فَآخَرَانِ يَقُومَانِ مَقَامَهُمَا مِنَ الَّذِينَ اسْتَحَقَّ عَلَيْهِمُ الْأَوْلَيَانِ فَيُقْسِمَانِ بِاللَّهِ لَشَهَادَتُنَا أَحَقُّ مِن شَهَادَتِهِمَا وَمَا اعْتَدَيْنَا إِنَّا إِذًا لَّمِنَ الظَّالِمِينَ﴾
[ المائدة: 107]

5:107 But if it is found that those two were guilty of perjury, let two others stand in their place [who are] foremost [in claim] from those who have a lawful right. And let them swear by Allah, "Our testimony is truer than their testimony, and we have not transgressed. Indeed, we would then be of the wrongdoers."

If, after the oath is taken, it is established that the witnesses lied in their testimony or in the oath, then let two others who are closest to the deceased take an oath on the truth in their place.
These new witnesses should take an oath by Allah saying, ‘Our testimony about their lying and deceit is closer to the truth than their testimony about their honesty and trustworthiness.
We have not taken a false oath.
If we do so, we will be from the wrongdoers who overstep Allah’s limits’.

If then it gets known that these two had been guilty of sin, let two others stand forth in their places, nearest in kin from among those who claim a lawful right. Let them swear by Allah (saying): "We affirm that our testimony is truer than that of both of them, and that we have not trespassed (the truth), for then indeed we should be of the wrong-doers."

phonetic Transliteration

Fain AAuthira AAala annahuma istahaqqa ithman faakharani yaqoomani maqamahuma mina allatheena istahaqqa AAalayhimu alawlayani fayuqsimani biAllahi lashahadatuna ahaqqu min shahadatihima wama iAAtadayna inna ithan lamina alththalimeena

Abdullah Yusuf Ali - Translation

But if it gets known that these two were guilty of the sin (of perjury), let two others stand forth in their places,- nearest in kin from among those who claim a lawful right: let them swear by Allah: "We affirm that our witness is truer than that of those two, and that we have not trespassed (beyond the truth): if we did, behold! the wrong be upon us!"

Safi-ur-Rahman al-Mubarakpuri

If it then becomes known that these two had been guilty of sin, let two others stand forth in their places, nearest in kin from among those who claim a lawful right. Let them swear by Allah (saying): "We affirm that our testimony is truer than that of both of them, and that we have not trespassed (the truth), for then indeed we should be of the wrongdoers."

Page 125 English transliteration