Deuteronomy 16:7-17

7You must cook and eat it in the place the Lord your God chooses; you may return the next morning to your tents.

8You must eat bread made without yeast for six days. The seventh day you are to hold an assembly for the Lord your God; you must not do any work on that day.

9You must count seven weeks; you must begin to count them from the time you begin to harvest the standing grain.

10Then 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.

11You shall rejoice before him – you, your son, your daughter, your male and female slaves, the Levites in your villages, the resident foreigners, the orphans, and the widows among you – in the place where the Lord chooses to locate his name.

12Furthermore, remember that you were a slave in Egypt, and so be careful to observe these statutes.

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

14You are to rejoice in your festival, you, your son, your daughter, your male and female slaves, the Levites, the resident foreigners, the orphans, and the widows who are in your villages.

15You are to celebrate the festival seven days before the Lord your God in the place he chooses, for he will bless you in all your productivity and in whatever you do; so you will indeed rejoice!

16Three times a year all your males must appear before the Lord your God in the place he chooses for the Festival of Unleavened Bread, the Festival of Weeks, and the Festival of Temporary Shelters; and they must not appear before him empty-handed.

17Every one of you must give as you are able, according to the blessing of the Lord your God that he has given you.