Surah Al-A'raf (The Heights), Verse 143

وَلَمَّا جَآءَ مُوْسٰی لِمِیْقَاتِنَا وَكَلَّمَهٗ رَبُّهٗ قَالَ رَبِّ اَرِنِیْۤ اَنْظُرْ اِلَیْكَ قَالَ لَنْ تَرٰىنِیْ وَلٰكِنِ انْظُرْ اِلَی الْجَبَلِ فَاِنِ اسْتَقَرَّ مَكَانَهٗ فَسَوْفَ تَرٰىنِیْ فَلَمَّا تَجَلّٰی رَبُّهٗ لِلْجَبَلِ جَعَلَهٗ دَكًّا وَّخَرَّ مُوْسٰی صَعِقًا فَلَمَّاۤ اَفَاقَ قَالَ سُبْحٰنَكَ تُبْتُ اِلَیْكَ وَاَنَا اَوَّلُ الْمُؤْمِنِیْنَ ۟

Wa lammaa jaaa'a Moosa limeeqaatinaa wa kallamahoo Rabbuhoo qaala Rabbi arineee anzur ilaik; qaala lan taraanee wa laakininzur ilal jabali fa inistaqarra makaanahoo fasawfa taraanee; falammaa tajallaa Rabbuhoo liljabali ja'alahoo dakkanw wa kharra Moosaa sa'iqaa; falammaaa afaaqa qaala Subhaanaka tubtu ilaika wa ana awwalul mu'mineen

“When Moses came to the place appointed by Us, and his Lord addressed him, He said: "O my Lord! show (Thyself) to me, that I may look upon thee." Allah said: "By no means canst thou see Me (direct); But look upon the mount; if it abide in its place, then shalt thou see Me." When his Lord manifested His glory on the Mount, He made it as dust. And Moses fell down in a swoon. When he recovered his senses he said: "Glory be to Thee! to Thee I turn in repentance, and I am the first to believe."”

Quran 7:143 (Yusuf Ali Translation)