Ali's counsel on restraining lustful gazes
Nahj al-Balāgha|Volume 1|Book 3|Chapter 420
إِنَّ أَبْصَار هذِهِ الْفُحُولِ طَوَامِحُ وَإِنَّ ذلِكَ سَبَبُ هَبَابِهَا فإِذَا نَظَرَ أَحَدُكُمْ إِلَى امْرَأَةٍ تُعْجِبُهُ فَلْيُلاَمِسْ أَهْلَهُ، فَإِنَّمَا هِيَ امْرَأَهٌ كَامْرَأَةٍ.
The eyes of these men are covetous and this glancing is the cause of their becoming covetous. Whenever anyone of you sees a woman who attracts him, he should meet his wife because she is a woman like his wife.