Two slave girls were sewing leather in Taif when one of them came out with her hand bleeding. She claimed that her companion had injured her, but the other denied it. A letter was written to Ibn Abbas about this matter, and he wrote back saying that the Messenger of Allah ﷺ had ruled that the oath is upon the defendant, "for if people were granted whatever they claimed, some would claim others' wealth and lives. So summon her and recite to her this verse, 'Indeed, those who exchange the covenant of Allah and their oaths for a small price will have no share in the Hereafter'" [Aal Imran 3:77], until he completed the verse.So I summoned her and recited it to her, and she confessed to it, which pleased him.
أخبرنا علي بن سعيد بن مسروق قال حدثنا يحيى بن أبي زائدة عن نافع بن عمر
كانت جاريتان تخرزان بالطائف فخرجت إحداهما ويدها تدمى فزعمت أن صاحبتها أصابتها وأنكرت الأخرى فكتبت إلى ابن عباس في ذلك فكتب أن رسول الله ﷺ قضى أن اليمين على المدعى عليه ولو أن الناس أعطوا بدعواهم لادعى ناس أموال ناس ودماءهم فادعها واتل عليها هذه الآية {إن الذين يشترون بعهد الله وأيمانهم ثمنا قليلا أولئك لا خلاق لهم في الآخرة} حتى ختم الآية فدعوتها فتلوت عليها فاعترفت بذلك فسره
Reported by Bukhari, Rahn, chapter, "If the pledger and pledgee disagree," etc, no. 2514, and elsewhere, and by Muslim, Aqdiyah, chapter on the oath being upon the defendant, no. 2/1711, from the hadith of Nafi, from Ibn Umar, with the same wording.