וַתִּקְרְב֥וּן וַתַּֽעַמְד֖וּן תַּ֣חַת הָהָ֑ר וְהָהָ֞ר בֹּעֵ֤ר בָּאֵשׁ֙ עַד־לֵ֣ב הַשָּׁמַ֔יִם חֹ֖שֶׁךְ עָנָ֥ן וַעֲרָפֶֽל׃
And ye came near and stood under the mountain; and the mountain burned with fire unto the heart of heaven, with darkness, cloud, and thick darkness.
Read halakhic rulings (Jewish law) on Deuteronomy 4:11: and classical halakhic sources.