Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrated that Sayyiduna al-Fadl bin Abbas (may Allah be pleased with him) was riding behind the Prophet (peace and blessings be upon him). The young man began glancing at the women and looking at them, and the Messenger of Allah (peace and blessings be upon him) kept turning his face away with his hand from behind, while the young man kept looking at the women. So the Messenger of Allah (peace and blessings be upon him) said to him: "O my nephew! This is a day in which whoever controls his hearing, his sight and his tongue will be forgiven."
Hadith Referenceالمعجم الكبير للطبراني / باب الفاء / 15832