Deuteronomy 16:1, 10, 13

“Observe the month of Abib and celebrate the Passover to the LORD your God, for in the month of Abib the LORD your God brought you out of Egypt by night.

Then you shall celebrate the Feast of Weeks to the LORD your God with a tribute of a freewill offering from your hand, which you shall give [to Him] just as the LORD your God blesses you

“You shall celebrate the Feast of Booths (Tabernacles) seven days, when you have gathered in [the grain] from your threshing floor and [the wine] from your wine vat.