Leviticus 23:39,40
Also in the fifteenth day of the seventh month, when you have gathered in the fruit of the land, you shall keep a feast to the LORD seven days: on the first day shall be a sabbath, and on the eighth day shall be a sabbath.
Nave's Topical Index—AKJV

Numbers 28:18-25
In the first day shall be an holy convocation; you shall do no manner of servile work therein:
Nave's Topical Index—AKJV

Numbers 29:12,35
And on the fifteenth day of the seventh month you shall have an holy convocation; you shall do no servile work, and you shall keep a feast to the LORD seven days:
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Nehemiah 8:1-18
And all the people gathered themselves together as one man into the street that was before the water gate; and they spoke to Ezra the scribe to bring the book of the law of Moses, which the LORD had commanded to Israel.
Nave's Topical Index—AKJV