The Feast of Pentecost: The Law Given from Mount Sinai Upon

You must keep it until the fourteenth day of the month, when the whole assembly of the congregation of Israel will slaughter the animals at twilight.

On that night I will pass through the land of Egypt and strike down every firstborn male, both man and beast, and I will execute judgment against all the gods of Egypt. I am the LORD.

In the third month, on the same day of the month that the Israelites had left the land of Egypt, they came to the Wilderness of Sinai.

…and be prepared by the third day, for on the third day the LORD will come down on Mount Sinai in the sight of all the people.