Read Numbers 29:12 Using Other Translations
And on the fifteenth day of the seventh month ye shall have an holy convocation; ye shall do no servile work, and ye shall keep a feast unto the LORD seven days:
"On the fifteenth day of the seventh month you shall have a holy convocation. You shall not do any ordinary work, and you shall keep a feast to the LORD seven days.
“Five days later, on the fifteenth day of the same month, you must call another holy assembly of all the people, and you may do no ordinary work on that day. It is the beginning of the Festival of Shelters, a seven-day festival to the LORD .