Deuteronomy 16:14-15

Everybody should rejoice at your Feast: you, your sons and daughters, your male and female servants, the Levites, strangers, orphans, and widows who live in your towns. Celebrate the Feast to the LORD your God for seven days at the place he will choose, because the LORD your God will bless all your harvest and all the work you do, and you will be completely happy.