וַיֹּ֕אמֶר אֶת־קֹלְךָ֥ שָׁמַ֖עְתִּי בַּגָּ֑ן וָאִירָ֛א כִּֽי־עֵירֹ֥ם אָנֹ֖כִי וָאֵחָבֵֽא׃
他說：「我在園中聽見了你的聲音，就害怕了，因為我赤身露體，所以我躲藏起來。」
Reshit Chokhmah
The first awe in the Torah is when the First Human sinned "I was afraid because I was naked, so I hid" (Gen. 3:10). The issue is that before his sin the Human was dressed in garments of light, and after his sin the upper light fled from him, and he realized and dressed garments of skin, and this is the fear - he was afraid because he saw that the was naked from the upper light. And so every person needs to have this aspect of awe, so one will not make, through one's sins, that the light of the Shechinah separates from him/her, since it is through dealing with Torah and mitzvah that a person allures the light of the Shechinah on him/her, and if God forbid one sins, it separates from that person, and they become naked. And this is another aspect in the issue of fear of sin besides what I explained.