2 Chronicles 7:9

There was an assembly on the eighth day. They observed the dedication of the altar for seven days and celebrated the festival for another seven days.

Leviticus 23:36

Bring a sacrifice by fire to Jehovah for seven consecutive days. On the eighth day there will be a holy assembly. Bring Jehovah a sacrifice by fire. This is the last festival of the year. Do not do any regular work.

Deuteronomy 16:8

Eat unleavened bread for six days. On the seventh day there shall be a solemn assembly to Jehovah your God. Do not do work on it.

1 Kings 8:65

At that time Solomon and all Israel celebrated the festival. A large crowd had come from the territory between the border of Hamath and the River of Egypt to be near Jehovah our God for seven days.

2 Chronicles 30:23

Then the whole assembly decided to celebrate the festival for seven more days. So they joyfully celebrated for seven more days.

Nehemiah 8:18

Day by day, from the first day till the last, he read from the book of the Law of God. They kept the feast for seven days: and on the eighth day there was a holy meeting, as it is ordered in the law.

Joel 1:14

Sanctify a fast! Call a solemn assembly. Gather the elders and all the inhabitants of the land to the House of Jehovah your God. Call out to Jehovah.

Treasury of Scripture Knowledge

Summary

And in the eighth day they made a solemn assembly: for they kept the dedication of the altar seven days, and the feast seven days.

General references

Bible References

Solemn assembly

Leviticus 23:36
Bring a sacrifice by fire to Jehovah for seven consecutive days. On the eighth day there will be a holy assembly. Bring Jehovah a sacrifice by fire. This is the last festival of the year. Do not do any regular work.
Deuteronomy 16:8
Eat unleavened bread for six days. On the seventh day there shall be a solemn assembly to Jehovah your God. Do not do work on it.
Nehemiah 8:18
Day by day, from the first day till the last, he read from the book of the Law of God. They kept the feast for seven days: and on the eighth day there was a holy meeting, as it is ordered in the law.
Joel 1:14
Sanctify a fast! Call a solemn assembly. Gather the elders and all the inhabitants of the land to the House of Jehovah your God. Call out to Jehovah.

General references

John 7:2
It was time for the Jewish Feast of Tabernacles.