Sahih Muslim - Book 13, Hadith 79
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'A'isha (Allah be pleased with her) said that the Messenger of Allah (ﷺ) kissed one of his wives while he was fasting, and then she ('A'isha) smiled (as she narrated).
How the Prophet ص modelled this behaviour here
Affection & Tenderness
“the Messenger of Allah (ﷺ) kissed one of his wives”
Openly expresses love, affection and tenderness to his wife through warmth, closeness and kind gestures.