Fornication of the eyes – the look .. “Bukhari, no. 6122
Imam Badruddin al-Aini said, may Allah have mercy on him:
“That is: a look at an outsider woman , and Ibn Mas’ud said:
“The eyes commit adultery by looking, and lips commit adultery, and their fornication is a kiss, and their hands commit adultery, and their fornication is a touch, and their feet commit adultery, and their fornication is walking.”
And it is said: ” Truly, these things are called adultery, because they call to him.“
See Umdatul Qari, 33-438