Sahih al-Bukhari, Volume 3, Book 45, Hadith 691 (USC-MSA) ⓘ
Narrated Ibn Abu Mulaika: I wrote a letter to Ibn `Abbas and he wrote to me that the Prophet had given the verdict that the defendant had to take an oath.
حَدَّثَنَا خَلاَّدُ بْنُ يَحْيَى، حَدَّثَنَا نَافِعُ بْنُ عُمَرَ، عَنِ ابْنِ أَبِي مُلَيْكَةَ، قَالَ كَتَبْتُ إِلَى ابْنِ عَبَّاسٍ فَكَتَبَ إِلَىَّ أَنَّ النَّبِيَّ صلى الله عليه وسلم قَضَى أَنَّ الْيَمِينَ عَلَى الْمُدَّعَى عَلَيْهِ.
also referenced under: Book 48, Hadith 7 (In-Book) & Hadith 2514 (DarusSalam)