Verse

Exodus 19:16

A church father on this verse
The third day, however, is always applied to mysteries. For when the people had departed from Egypt, they offer sacrifice to God on the third day and are purified on the third day. And the third day is the day of the Lord's resurrection. Many other mysteries also are anticipated in this day.
Origen of Alexandria, 3th c. — HOMILIES ON GENESIS 8:4
Original

16And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that was in the camp trembled.

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In context

14And Moses went down from the mount unto the people, and sanctified the people; and they washed their clothes.

15And he said unto the people, Be ready against the third day: come not at your wives.

Exodus 19:16

17And Moses brought forth the people out of the camp to meet with God; and they stood at the nether part of the mount.

18And mount Sinai was altogether on a smoke, because the LORD descended upon it in fire: and the smoke thereof ascended as the smoke of a furnace, and the whole mount quaked greatly.

Read all of Exodus 19