The proof after (the defendant) has taken the oath

Narrated Um Salama:

Once Allah's Apostle ﷺ said, "You people present your cases to me and some of you may be more eloquent and persuasive in presenting their argument. So, if I give some one's right to another (wrongly) because of the latter's (tricky) presentation of the case, I am really giving him a piece of fire;
so he should not take it."

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ زَيْنَبَ، عَنْ أُمِّ سَلَمَةَ ـ رضى الله عنها ـ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ " إِنَّكُمْ تَخْتَصِمُونَ إِلَىَّ، وَلَعَلَّ بَعْضَكُمْ أَلْحَنُ بِحُجَّتِهِ مِنْ بَعْضٍ، فَمَنْ قَضَيْتُ لَهُ بِحَقِّ أَخِيهِ شَيْئًا بِقَوْلِهِ، فَإِنَّمَا أَقْطَعُ لَهُ قِطْعَةً مِنَ النَّارِ فَلاَ يَأْخُذْهَا ".