Sahih Muslim 4471
The Book of Judicial Decisions
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، عَنْ نَافِعِ بْنِ عُمَرَ، عَنِ ابْنِ، أَبِي مُلَيْكَةَ عَنِ ابْنِ عَبَّاسٍ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَضَى بِالْيَمِينِ عَلَى الْمُدَّعَى عَلَيْهِ .
Ibn 'Abbas reported that Allah's Messenger (ﷺ) pronounced judgment on the basis of oath by the defendant
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.