Sayyiduna Uqbah bin Amir (may Allah be pleased with him) said: I saw the Messenger of Allah (peace and blessings be upon him) recite the last verse of Surah al-Nur, and while doing so he (peace and blessings be upon him) had placed his two fingers beneath his eyes, saying: "He is All-Seeing of everything."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14848