Ibn Mas'ud reported that a person came to Messenger of Allah 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).

أَنَّ رَجُلاً أَتَى النَّبِيَّ ﷺ فَذَكَرَ أَنَّهُ أَصَابَ مِنِ امْرَأَةٍ إِمَّا قُبْلَةً أَوْ مَسًّا بِيَدٍ أَوْ شَيْئًا كَأَنَّهُ يَسْأَلُ عَنْ كَفَّارَتِهَا قَالَ فَأَنْزَلَ اللَّهُ ﷻ ثُمَّ ذَكَرَ بِمِثْلِ حَدِيثِ يَزِيدَ

“And perform prayers at the two ends of the day and in some hours of the night. Verily, the good deeds remove the evil deeds. That is a reminder for the mindful.” [11:114] The man said: “O Messenger of Allah, is this (the Verse) just for me?” He said: “It is for whoever acts upon it among my nation.” (Using translation from Ibn Mājah 4254)

أَنَّ رَجُلًا أَتَى النَّبِيَّ ﷺ فَذَكَرَ أَنَّهُ أَصَابَ مِنَ امْرَأَةٍ قُبْلَةً كَأَنَّهُ يَسْأَلُ عَنْ كَفَّارَتِهَا فَأَنْزَلَ اللَّهُ جَلَّ وَعَلَا {أَقِمِ الصَّلَاةَ طَرَفَيِ النَّهَارِ وَزُلَفًا مِنَ اللَّيْلِ إِنَّ الْحَسَنَاتِ يُذْهِبْنَ السَّيِّئَاتِ ذَلِكَ ذِكْرَى لِلذَّاكِرِينَ} قَالَ فَقَالَ الرَّجُلُ أَلِي هَذِهِ؟ قَالَ «هِيَ لِمَنْ عَمِلَ بِهَا مِنْ أُمَّتِي»