Sahih Muslim 1108
Sahih Muslim · Book 13: The Book of Fasting · Clarifying that Kissing when fasting is not unlawful for the one whose desire is not provoked by that
Umar b Abu Salama reported that he asked the Messenger of Allah (ﷺ):
حَدَّثَنِي هَارُونُ بْنُ سَعِيدٍ الأَيْلِيُّ ، حَدَّثَنَا ابْنُ وَهْبٍ ، أَخْبَرَنِي عَمْرٌو، - وَهُوَ ابْنُ الْحَارِثِ - عَنْ عَبْدِ رَبِّهِ بْنِ سَعِيدٍ ، عَنْ عَبْدِ اللَّهِ بْنِ كَعْبٍ الْحِمْيَرِيِّ ، عَنْ عُمَرَ بْنِ أَبِي سَلَمَةَ ، أَنَّهُ سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم أَيُقَبِّلُ الصَّائِمُ فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم " سَلْ هَذِهِ " . لأُمِّ سَلَمَةَ فَأَخْبَرَتْهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم يَصْنَعُ ذَلِكَ فَقَالَ يَا رَسُولَ اللَّهِ قَدْ غَفَرَ اللَّهُ لَكَ مَا تَقَدَّمَ مِنْ ذَنْبِكَ وَمَا تَأَخَّرَ . فَقَالَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم " أَمَا وَاللَّهِ إِنِّي لأَتْقَاكُمْ لِلَّهِ وَأَخْشَاكُمْ لَهُ " .
Should one observing fast kiss (his wife)? The Messenger of Allah (ﷺ) said to him: Ask her (Umm Salama). She informed him that the Messenger of Allah (ﷺ) did that, where upon he said: Messenger of Allah, Allah pardoned thee all thy sins, the previous and the later ones. Upon this the Messenger of Allah (ﷺ) ) said: By Allah, I am the most God conscious among you and I fear Him most among you.