عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كُتِبَ عَلَى ابْنِ آدَمَ نَصِيبُهُ مِنَ الزِّنَا أَدْرَكَ لَا مَحَالَةَ فَالْعَيْنُ زِنْيَتُهَا النَّظَرُ وَيُصَدِّقُهَا الْأَعْرَاضُ وَاللِّسَانُ زِنْيَتُهُ النُّطْقُ وَالْقَلْبُ الْمُتَمَنِّي وَالْفَرْجُ يُصَدِّقُ مَا ثَمَّ وَيُكَذِّبُ
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Allah Almighty has written the share of adultery for the son of Adam, he will inevitably get it. The adultery of the eye is looking, then various (spiritual) ailments confirm it. The adultery of the tongue is speaking. The heart desires, and the private parts either confirm all these matters or deny them.