Allah's Statement: "Allah will not punish you for what is unintentional in your oaths..." (V.5:89) Sahih al-Bukhari 4613
Arabic hadith text
حَدَّثَنَا عَلِيُّ بْنُ سَلَمَةَ، حَدَّثَنَا مَالِكُ بْنُ سُعَيْرٍ، حَدَّثَنَا هِشَامٌ، عَنِ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـأُنْزِلَتْ هَذِهِ الآيَةُ {لاَ يُؤَاخِذُكُمُ اللَّهُ بِاللَّغْوِ فِي أَيْمَانِكُمْ} فِي قَوْلِ الرَّجُلِ لاَ وَاللَّهِ، وَبَلَى وَاللَّهِ.
Translation
Narrated `Aisha
This Verse: "Allah will not punish you for what is unintentional in your oaths." (5.89) was revealed about a man's state men (during his talk), "No, by Allah," and "Yes, by Allah."