it was narrated that Umar bin al-Khattab said: I was in good spirits one day and kissed (my wife) when I was fasting. I came to the Prophet (ﷺ) ﷺ and said: I have done something serious. I kissed (my wife) when I was fasting. The Messenger of Allah (ﷺ) ﷺ said: “What do you think if you rinse your mouth with water when you are fasting?` I said: There is nothing wrong with it. The Messenger of Allah (ﷺ) ﷺ said: “Then why (are you worried)?`
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا حَجَّاجٌ، حَدَّثَنَا لَيْثٌ، حَدَّثَنِي بُكَيْرٌ، عَنْ عَبْدِ الْمَلِكِ بْنِ سَعِيدٍ الْأَنْصَارِيِّ، عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ، عَنْ عُمَرَ بْنِ الْخَطَّابِ، رَضِيَ اللَّهُ عَنْهُ قَالَ هَشَشْتُ يَوْمًا فَقَبَّلْتُ وَأَنَا صَائِمٌ فَأَتَيْتُ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَقُلْتُ صَنَعْتُ الْيَوْمَ أَمْرًا عَظِيمًا فَقَبَّلْتُ وَأَنَا صَائِمٌ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَرَأَيْتَ لَوْ تَمَضْمَضْتَ بِمَاءٍ وَأَنْتَ صَائِمٌ قُلْتُ لَا بَأْسَ بِذَلِكَ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ فَفِيمَ.
sunnah.com