Deuteronomy 16:13

10 Then keep the feast of weeks to the Lord your God, with an offering freely given to him from the wealth he has given you:

11 Then you are to be glad before the Lord your God, you and your son and your daughter, your man-servant and your woman-servant, and the Levite who is with you, and the man from a strange country, and the child without a father, and the widow, who are living among you, in the place marked out by the Lord your God as a resting-place for his name.

12 And you will keep in mind that you were a servant in the land of Egypt: and you will take care to keep all these laws.

13 You are to keep the feast of tents for seven days after you have got in all your grain and made your wine:

14 You are to keep the feast with joy, you and your son and your daughter, your man-servant and your woman-servant, and the Levite, and the man from a strange country, and the child without a father, and the widow, who are living among you.

15 Keep the feast to the Lord your God for seven days, in the place marked out by the Lord: because the blessing of the Lord your God will be on all the produce of your land and all the work of your hands, and you will have nothing but joy.

16 Three times in the year let all your males come before the Lord your God in the place named by him; at the feast of unleavened bread, the feast of weeks, and the feast of tents: and they are not to come before the Lord with nothing in their hands;