Psalms 68:8
The earth shook, the heavens also dropped at the presence of God: even Sinai itself was moved at the presence of God, the God of Israel. The earth shook, the heavens also dropped at the presence of God: even Sinai itself was moved at the presence of God, the God of Israel.
When the law was proclaimed at Sinai, the presence of God shook the earth and moved the mountain itself. That shaking was an unparalleled display of divine power. It stands as the precedent for the still greater shaking of earth and heaven to come at the judgment.