Leviticus 23:41-45

So you shall celebrate it as a feast to the Lord for seven days in the year. It shall be a permanent statute throughout your generations; you shall celebrate it in the seventh month.

You shall live in booths for seven days; all the native-born in Israel shall live in booths,

so that your generations may know that I had the sons of Israel live in booths when I brought them out from the land of Egypt. I am the Lord your God.’ ”

So Moses declared to the sons of Israel the appointed times of the Lord.