Muwatta Malik · Hadith 649

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

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).