Deuteronomy 16:1, 10, 13

“Observe the month of Abib and keep 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 keep the Feast of Weeks to the LORD your God with the tribute of a freewill offering from your hand, which you shall give as the LORD your God blesses you.

“You shall keep the Feast of Booths seven days, when you have gathered in the produce from your threshing floor and your winepress.