2 Chronicles 7:9

And they make on the eighth day a restraint, because the dedication of the altar they have made seven days, and the feast seven days.

Leviticus 23:36

seven days ye bring near a fire-offering to Jehovah, on the eighth day ye have a holy convocation, and ye have brought near a fire-offering to Jehovah; it is a restraint, ye do no servile work.

Deuteronomy 16:8

six days thou dost eat unleavened things, and on the seventh day is a restraint to Jehovah thy God; thou dost do no work.

1 Kings 8:65

And Solomon maketh, at that time, the festival -- and all Israel with him, a great assembly from the entering in of Hamath unto the brook of Egypt -- before Jehovah our God, seven days and seven days; fourteen days.

2 Chronicles 30:23

And all the assembly take counsel to keep other seven days, and they keep seven days with joy;

Nehemiah 8:18

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.

Joel 1:14

Sanctify a fast, proclaim a restraint, Gather the elders -- all the inhabitants of the land, Into the house of Jehovah your God,

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
seven days ye bring near a fire-offering to Jehovah, on the eighth day ye have a holy convocation, and ye have brought near a fire-offering to Jehovah; it is a restraint, ye do no servile work.
Deuteronomy 16:8
six days thou dost eat unleavened things, and on the seventh day is a restraint to Jehovah thy God; thou dost do no work.
Nehemiah 8:18
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.
Joel 1:14
Sanctify a fast, proclaim a restraint, Gather the elders -- all the inhabitants of the land, Into the house of Jehovah your God,

General references

John 7:2
and the feast of the Jews was nigh -- that of tabernacles --