Leviticus 23:8

Bring a sacrifice to Jehovah for seven days. On the seventh day there will be a holy assembly. Do not do any regular work.'

Treasury of Scripture Knowledge

Summary

But ye shall offer an offering made by fire unto the LORD seven days: in the seventh day is an holy convocation: ye shall do no servile work therein.

Bible References

General references

Exodus 13:6
You must eat unleavened bread seven days. The seventh day will be a feast to Jehovah.
Leviticus 23:35
There will be a holy assemble on the first day. Do not do any regular work.
Numbers 28:16
Jehovah's Passover is the fourteenth day of the first month.