וְהָי֥וּ נְכֹנִ֖ים לַיּ֣וֹם הַשְּׁלִישִׁ֑י כִּ֣י ׀ בַּיּ֣וֹם הַשְּׁלִישִׁ֗י יֵרֵ֧ד יְהוָ֛ה לְעֵינֵ֥י כָל־הָעָ֖ם עַל־הַ֥ר סִינָֽי׃
and be ready against the third day; for the third day the LORD will come down in the sight of all the people upon mount Sinai.
Find Mishnaic references to Exodus 19:11: , passages from the 63 tractates of the Mishnah.