كتاب الاستئذان
Read the English translation first, with the original Arabic directly underneath.
Narrated Ibn `Abbas:
I have not seen a thing resembling 'lamam' (minor sins) than what Abu Huraira 'narrated from the Prophet (ﷺ) who said "Allah has written for Adam's son his share of adultery which he commits inevitably. The adultery of the eyes is the sight (to gaze at a forbidden thing), the adultery of the tongue is the talk, and the inner self wishes and desires and the private parts testify all this or deny it."
إِنَّ اللَّهَ كَتَبَ عَلَى ابْنِ آدَمَ حَظَّهُ مِنَ الزِّنَا، أَدْرَكَ ذَلِكَ لاَ مَحَالَةَ، فَزِنَا الْعَيْنِ النَّظَرُ، وَزِنَا اللِّسَانِ الْمَنْطِقُ، وَالنَّفْسُ تَمَنَّى وَتَشْتَهِي، وَالْفَرْجُ يُصَدِّقُ ذَلِكَ كُلَّهُ وَيُكَذِّبُهُ