Numbers 9:1-5

A year after Israel’s departure from Egypt, the LORD spoke to Moses in the wilderness of Sinai. In the first month of that year he said, “Tell the Israelites to celebrate the Passover at the prescribed time, at twilight on the fourteenth day of the first month. Be sure to follow all my decrees and regulations concerning this celebration.” So Moses told the people to celebrate the Passover in the wilderness of Sinai as twilight fell on the fourteenth day of the month. And they celebrated the festival there, just as the LORD had commanded Moses.