and be ready by the third day, because on the third day the Lord will come down on Mount Sinai [in the cloud] in the sight of all the people.

In the third month after the children of Israel had left the land of Egypt, the very same day, they came into the Wilderness of Sinai.

So it happened on the third day, when it was morning, that there were thunder and flashes of lightning, and a thick cloud was on the mountain, and a very loud blast was sounded on a ram’s horn, so that all the people who were in the camp trembled.

You shall not worship them nor serve them; for I, the Lord your God, am a jealous (impassioned) God [demanding what is rightfully and uniquely mine], visiting (avenging) the iniquity (sin, guilt) of the fathers on the children [that is, calling the children to account for the sins of their fathers], to the third and fourth generations of those who hate Me,

Also [you shall observe] the Feast of Harvest (Weeks, Pentecost, or First Fruits), acknowledging the first fruits of your labor, of what you sow in the field. And [third] the Feast of Ingathering (Booths or Tabernacles) at the end of the year when you gather in [the fruit of] your labors from the field.