Narrated Umm Salamah (RA): Allah's Messenger (ﷺ) said, "Indeed, you bring your disputers to me, and perhaps some of you are more eloquent in their plea than others, so that I give judgement on their behalf according to what I hear from them. Therefore, whatever I rule for anyone which by right belongs to his brother, I am only granting him a portion of Hell-fire." .
Source: sunnah.com
Other translations
Arabic
وَعَنْ أُمِّ سَلَمَةَ رَضِيَ اَللَّهُ عَنْهَا قَالَتْ: قَالَ رَسُولُ اَللَّهِ - صلى الله عليه وسلم -: { " إِنَّكُمْ تَخْتَصِمُونَ إِلَيَّ, وَلَعَلَّ بَعْضَكُمْ أَنْ يَكُونَ أَلْحَنَ بِحُجَّتِهِ مِنْ بَعْضٍ, فَأَقْضِيَ لَهُ عَلَى نَحْوٍ مِمَّا أَسْمَعُ, مِنْهُ فَمَنْ قَطَعْتُ لَهُ مِنْ حَقِّ أَخِيهِ شَيْئًا, فَإِنَّمَا أَقْطَعُ لَهُ قِطْعَةً مِنَ اَلنَّارِ" } مُتَّفَقٌ عَلَيْهِ 1 .
sunnah.com