It is narrated from Sayyiduna Mu'awiyah bin Haydah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "There are three eyes which the Fire of Hell will not see: an eye that kept watch in the path of Allah, an eye that wept out of fear of Allah, and an eye that was lowered from the things Allah has made unlawful."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 17052