Al-A'raaf 7:143

When Moses came at Our appointed time and his Lord spoke to him, he said, “My Lord, reveal Yourself to me so that I may look at You.” Allah said, “You will not be able to see Me[47]. But look at the mountain; if it stays firm in its place, only then will you see Me.” When his Lord appeared to the mountain, it was leveled to dust and Moses fell unconscious. When he recovered, he said, “Glory be to You! I repent to You and I am the first of the believers.”

[47] None can see Allah in the life of this world.

And when Moses arrived at Our appointed time and his Lord spoke to him, he said, "My Lord, show me [Yourself] that I may look at You." [Allāh] said, "You will not see Me,[401] but look at the mountain; if it should remain in place, then you will see Me." But when his Lord appeared to the mountain, He rendered it level,[402] and Moses fell unconscious. And when he awoke, he said, "Exalted are You! I have repented to You, and I am the first [among my people] of the believers."[403]

[401] That no one can see Allāh during the life of this world.
[402] It crumbled to dust.
[403] This is a severe warning from Allāh against rebellion.

143. And when Mûsâ (Moses) came at the time and place appointed by Us, and his Lord (Allah) spoke to him; he said: "O my Lord! Show me (Yourself), that I may look upon You." Allâh said: "You cannot see Me, but look upon the mountain; if it stands still in its place then you shall see Me." So when his Lord appeared to the mountain[7], He made it collapse to dust, and Mûsâ (Moses) fell down unconscious. Then when he recovered his senses he said: "Glory be to You, I turn to You in repentance and I am the first of the believers."

[7] (V.7:143) The appearance of Allâh جل جلاله to the mountain was very little of Him. It was approximately equal to the tip of one’s little finger as explained by the Prophet صلى الله عليه وسلم when he recited this Verse. (This hadîth is quoted by Tirmidhi).

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.