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 of your hand, which you shall give just as the LORD your God blesses you

“You shall celebrate the Feast of Booths seven days after you have gathered in from your threshing floor and your wine vat