Deuteronomy 16:13-17

“You shall celebrate the Feast of Booths (Tabernacles) seven days, when you have gathered in [the grain] from your threshing floor and [the wine] from your wine vat. You shall rejoice in your feast, you and your son and your daughter and your male and female servants and the Levite and the stranger and the orphan and the widow who are within your city. 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. “Three times a year all your males shall appear before the LORD your God in the place which He chooses, at the Feast of Unleavened Bread (Passover) and at the Feast of Weeks (Pentecost) and at the Feast of Booths (Tabernacles), and they shall not appear before the LORD empty-handed. Every man shall give as he is able, in accordance with the blessing which the LORD your God has given you.