Deuteronomy 16:13-15

13 You shall observe the feast of tabernacles seven days, after that you have gathered in your corn and your wine:

14 And you shall rejoice in your feast, you, and your son, and your daughter, and your manservant, and your maidservant, and the Levite, the stranger, and the fatherless, and the widow, that are within your gates.

15 Seven days shall you keep a solemn feast to the LORD your God in the place which the LORD shall choose: because the LORD your God shall bless you in all your increase, and in all the works of your hands, therefore you shall surely rejoice.