Ibn Abi Mulaykah (may Allah have mercy on him) said: Two women were sewing (leather) in a house. One of them came out with an awl driven through her palm. The matter was brought to Sayyiduna Ibn Abbas (may Allah be pleased with them both).
He said that the Messenger of Allah (peace and blessings be upon him) said: "If people were given (everything) on the basis of their claims, they would claim people's blood and wealth." Then he said: Admonish her by Allah and recite this verse to her: "Indeed, those who exchange the covenant of Allah and their oaths for a small price" [Surah Al Imran: 77], that is, they take a small price in return for Allah's covenant and their oaths. So she was admonished, and that woman confessed.
(b) Sayyiduna Ibn Abbas (may Allah be pleased with them both) said that the Prophet (peace and blessings be upon him) said: "The oath is upon the defendant."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الشهادات / 21199