(44) باب مَا يُؤْمَرُ بِهِ مِنْ غَضِّ الْبَصَرِ
Ibn 'Abbas said "I did not see anything more resembling to minor sins than what Abu Hurairah reported from the Prophet (ﷺ) who said "Allaah has decreed for the children of Adam a share in adultery, he will get it by all means, the adultery of eyes is looking; the adultery of tongue is speaking; the soul desires and has a passion; the private parts confirms or falsifies it."
Reference: Sunan Abi Dawud 2152
In-book reference: Book 12, Hadith 107
English translation: Book 11, Hadith 2147