הָרִ֥ים נָזְל֖וּ מִפְּנֵ֣י יְהוָ֑ה זֶ֣ה סִינַ֔י מִפְּנֵ֕י יְהוָ֖ה אֱלֹהֵ֥י יִשְׂרָאֵֽל׃
The mountains quaked at the presence of the LORD, Even yon Sinai at the presence of the LORD, the God of Israel.
Read kabbalistic (mystical) interpretation of Judges 5:5: and classical mystical sources.