Al-A'raf 7:143 ولما جاء موسى لميقاتنا وكلمه ربه قال رب ارني انظر اليك قال لن تراني ولاكن انظر الى الجبل فان استقر مكانه فسوف تراني فلما تجلى ربه للجبل جعله دكا وخر موسى صعقا فلما افاق قال سبحانك تبت اليك وانا اول المومنين ١٤٣

And when Moses came to Our appointed tryst and his Lord had spoken unto him, he said: My Lord! Show me (Thy Self), that I may gaze upon Thee. He said: Thou wilt not see Me, but gaze upon the mountain! If it stand still in its place, then thou wilt see Me. And when his Lord revealed (His) glory to the mountain He sent it crashing down. And Moses fell down senseless. And when he woke he said: Glory unto Thee! I turn unto Thee repentant, and I am the first of (true) believers.