41 You shall keep it as a feast to Yahweh seven days in the year. It is a statute forever throughout your generations. You shall keep it in the seventh month.
Leviticus 23:41 Cross References - WEB
Numbers 29:12
12 “‘On the fifteenth day of the seventh month you shall have a holy convocation. You shall do no regular work. You shall keep a feast to Yahweh seven days.
Nehemiah 8:18
18 Also day by day, from the first day to the last day, he read in the book of the law of God. They kept the feast seven days; and on the eighth day was a solemn assembly, according to the ordinance.