וַיַּעֲמֹ֥ד הָעָ֖ם מֵרָחֹ֑ק וּמֹשֶׁה֙ נִגַּ֣שׁ אֶל־הָֽעֲרָפֶ֔ל אֲשֶׁר־שָׁ֖ם הָאֱלֹהִֽים׃ (פ)
And the people stood afar off; but Moses drew near unto the thick darkness where God was.
Read halakhic rulings (Jewish law) on Exodus 20:18: and classical halakhic sources.