Surah Al-Baqarah, ayah 55

وَإِذۡ قُلۡتُمۡ يَٰمُوسَىٰ لَن نُّؤۡمِنَ لَكَ حَتَّىٰ نَرَى ٱللَّهَ جَهۡرَةٗ فَأَخَذَتۡكُمُ ٱلصَّٰعِقَةُ وَأَنتُمۡ تَنظُرُونَ ٥٥

Wa idh qultum yāmūsā lan nu'mina laka hattā narallāha jahratan fa akhadhatkumus-sā'iqatu wa antum tanzurūn

And [recall] when you said, "O Moses, we will never believe you until we see Allāh outright"; so the thunderbolt took you while you were looking on.