Hadith
حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ الأَعْلَى، حَدَّثَنَا الْمُعْتَمِرُ، عَنْ أَبِيهِ، حَدَّثَنَا أَبُو عُثْمَانَ، عَنِ ابْنِ، مَسْعُودٍ أَنَّ رَجُلاً، أَتَى النَّبِيَّ صلى الله عليه وسلم فَذَكَرَ أَنَّهُ أَصَابَ مِنِ امْرَأَةٍ إِمَّا قُبْلَةً أَوْ مَسًّا بِيَدٍ أَوْ شَيْئًا كَأَنَّهُ يَسْأَلُ عَنْ كَفَّارَتِهَا - قَالَ - فَأَنْزَلَ اللَّهُ عَزَّ وَجَلَّ . ثُمَّ ذَكَرَ بِمِثْلِ حَدِيثِ يَزِيدَ .
Ibn Mas'ud reported that a person came to Allah's Messenger (ﷺ) and told him that he had kissed a woman or touched her with his hand or did something like this. He inquired of him about its expiation. It was (on this occasion) that Allah, the Exalted and Glorious, revealed this verse (as mentioned above)
Sahih
Sahih Muslim 7004 ·Book 50, Hadith 48·Also available on sunnah.com·