וַיֵּ֧רֶד יְהוָ֛ה עַל־הַ֥ר סִינַ֖י אֶל־רֹ֣אשׁ הָהָ֑ר וַיִּקְרָ֨א יְהוָ֧ה לְמֹשֶׁ֛ה אֶל־רֹ֥אשׁ הָהָ֖ר וַיַּ֥עַל מֹשֶֽׁה׃
And the LORD came down upon mount Sinai, to the top of the mount; and the LORD called Moses to the top of the mount; and Moses went up.
Read kabbalistic (mystical) interpretation of Exodus 19:20: and classical mystical sources.