Muwatta Malik #670
Fasting
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
قَالَ يَحْيَى قَالَ مَالِكٌ قَالَ هِشَامُ بْنُ عُرْوَةَ قَالَ عُرْوَةُ بْنُ الزُّبَيْرِ لَمْ أَرَ الْقُبْلَةَ لِلصَّائِمِ تَدْعُو إِلَى خَيْرٍ .
Yahya said that Malik said that Hisham ibn Urwa ibn az-Zubayr had said, "I do not think that kissing invites to good for people who are fasting."
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About Muwatta Malik
This hadith is #670 from Muwatta Malik, in the Book of Fasting.