Numbers 29:35

“On the eighth day you are to hold a solemn assembly; you are not to do any daily work.

Leviticus 23:36

You are to present a fire offering to the Lord for seven days. On the eighth day you are to hold a sacred assembly and present a fire offering to the Lord. It is a solemn gathering; you are not to do any daily work.

John 7:37-39

On the last and most important day of the festival, Jesus stood up and cried out, “If anyone is thirsty, he should come to Me and drink!

Revelation 7:9-17

After this I looked, and there was a vast multitude from every nation, tribe, people, and language, which no one could number, standing before the throne and before the Lamb. They were robed in white with palm branches in their hands.

Treasury of Scripture Knowledge

Summary

On the eighth day ye shall have a solemn assembly: ye shall do no servile work therein:

Bible References

Eighth day

John 7:37
On the last and most important day of the festival, Jesus stood up and cried out, “If anyone is thirsty, he should come to Me and drink!
Revelation 7:9
After this I looked, and there was a vast multitude from every nation, tribe, people, and language, which no one could number, standing before the throne and before the Lamb. They were robed in white with palm branches in their hands.

Holman Christian Standard Bible®, Copyright © 1999, 2000, 2002, 2003, 2009 by Holman Bible Publishers.