Deuteronomy 16:12-15

121You shall also remember that you were a slave in Egypt, and you shall be careful and 2comply with these statutes.

13“3You shall 4celebrate the Feast of 5Booths for seven days when you have gathered in from your threshing floor and your wine vat; 14and you shall 6rejoice in your feast, you, your son and your daughter, and your male and female slaves, and the Levite, the stranger, the 7orphan, and the widow who are in your 8towns. 15For seven days you shall celebrate a feast to the Lord your God in the place which the Lord chooses, because the Lord your God will bless you in all your produce and in all the work of your hands, so that you will be altogether joyful.