Deuteronomy 16:1

The Passover-Unleavened Bread Festival

16:1 Observe the month Abib and keep the Passover to the Lord your God, for in that month he brought you out of Egypt by night.

Deuteronomy 16:10

16:10 Then you are to celebrate the Festival of Weeks before the Lord your God with the voluntary offering that you will bring, in proportion to how he has blessed you.

Deuteronomy 16:13

The Festival of Temporary Shelters

16:13 You must celebrate the Festival of Temporary Shelters for seven days, at the time of the grain and grape harvest.