Jarir said I asked the Apostle of Allaah ﷺ about an accidental glance (on a woman). He ﷺ said “Turn your eyes away.” (Using translation from Abū Dāʾūd 2148)   

سَأَلْتُ رَسُولَ اللهِ ﷺ عَنْ نَظْرَةِ الْفَجْأَةِ فَقَالَ «غُضَّ بَصَرَكَ»