Cross reference
Leviticus 23:41
41 `And ye have kept it a feast to Jehovah, seven days in a year -- a statute age-during to your generations; in the seventh month ye keep it a feast.
Numbers 29:12
12 `And on the fifteenth day of the seventh month a holy convocation ye have; ye do no servile work; and ye have celebrated a festival to Jehovah seven days,
Nehemiah 8:18
18 And he readeth in the book of the law of God day by day, from the first day till the last day, and they make a feast seven days, and on the eighth day a restraint, according to the ordinance.