Ata narrated: I and Ubaid bin Umair went to Aisha (may Allah be pleased with her) while she was observing i'tikaf at the place of Shaheer. I asked her about Allah's statement: "Allah will not call you to account for your unintentional oaths" (__QUR_N__: Al-Baqarah: 225). She replied: "These are (the oaths which people utter habitually, such as) 'No, by Allah!' or 'Yes, by Allah!'"
Hadith Referenceمسند الإمام الشافعي / كتاب القضاء والأحكام والدعاوى والبينات واليمين ومع الشاهد والأيمان والشهادات / 1723
Hadith Takhrijاخرجه ابو داود الايمان والنذور، باب لغو اليمين (3254) وصححه ابن حبان۔
It is narrated from Ibn Umar (may Allah be pleased with them both) that he said: "Whoever swears an oath and then affirms it, then (upon breaking it) it is obligatory for him to free a slave."
Hadith Referenceمسند الإمام الشافعي / كتاب القضاء والأحكام والدعاوى والبينات واليمين ومع الشاهد والأيمان والشهادات / 1725
Hadith Takhrijصحيح اخرجه البيهقي : 56/10 - وفى المعرفة السنن والآثار له (5814)۔