Hadithcore
Sahih Muslim, 1106 b
sahih

Sufyan reported:

I said to 'Abd al-Rahman b. Qasim: Have you heard from your father narrating from 'A'isha (Allah be pleased with her) that he kissed her while observing fast? He ('Abd al-Rahman b. Qasim) kept silence for a short while and then said:" Yes."

حَدَّثَنِي عَلِيُّ بْنُ حُجْرٍ السَّعْدِيُّ، وَابْنُ أَبِي عُمَرَ، قَالاَ حَدَّثَنَا سُفْيَانُ، قَالَ قُلْتُ لِعَبْدِ الرَّحْمَنِ بْنِ الْقَاسِمِ أَسَمِعْتَ أَبَاكَ يُحَدِّثُ عَنْ عَائِشَةَ، - رضى الله عنها - أَنَّ النَّبِيَّ صلى الله عليه وسلم كَانَ يُقَبِّلُهَا وَهُوَ صَائِمٌ فَسَكَتَ سَاعَةً ثُمَّ قَالَ نَعَمْ ‏.‏

References2 variants
In-Book Reference
Book 13, Hadith 80
USC-MSA web (English) reference
Book 6, Hadith 2437 (deprecated numbering scheme)