Deuteronomy 16:13

The Festival of Temporary Shelters

16:13 You must celebrate the Festival of Temporary Shelters for seven days, at the time of the grain and grape harvest.

Deuteronomy 16:15

16:15 You are to celebrate the festival seven days before the Lord your God in the place he chooses, for he will bless you in all your productivity and in whatever you do; so you will indeed rejoice!