Deuteronomy 16:12-15

12Remember that you were slaves in Egypt, and carefully follow these statutes.

13You are to celebrate the Feast of Tabernacles1 for seven days after you have gathered the produce of your threshing floor and your winepress. 14And you shall rejoice in your feast—you, your sons and daughters, your menservants and maidservants, and the Levite, as well as the foreigner, the fatherless, and the widows among you.

15For seven days you shall celebrate a feast to the LORD your God in the place He will choose, because the LORD your God will bless you in all your produce and in all the work of your hands, so that your joy will be complete.