Sunan Abi Dawud, Hadith 2148

Abu Hurairah reported the Prophet as saying “ Every child of Adam has his share in adultery. He then narrated the rest of the tradition. This version goes “And the hands commit adultery; their adultery is catching; and the legs commit adultery; their adultery is walking; and the mouth commits adultery – its adultery is kissing.”

حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا حَمَّادٌ، عَنْ سُهَيْلِ بْنِ أَبِي صَالِحٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ ‏"‏ لِكُلِّ ابْنِ آدَمَ حَظُّهُ مِنَ الزِّنَا ‏"‏ ‏.‏ بِهَذِهِ الْقِصَّةِ قَالَ ‏"‏ وَالْيَدَانِ تَزْنِيَانِ فَزِنَاهُمَا الْبَطْشُ وَالرِّجْلاَنِ تَزْنِيَانِ فَزِنَاهُمَا الْمَشْىُ وَالْفَمُ يَزْنِي فَزِنَاهُ الْقُبَلُ ‏"‏ ‏.‏

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also referenced under: Hadith 2153 (DarusSalam)