Leviticus 23:8

And you shall present an offering for Yahweh made by fire [for] seven days; on the seventh day [there shall be] a holy assembly; you shall 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
Seven days you will eat unleavened bread, and on the seventh day [will be] a feast for Yahweh.
Leviticus 23:35
On the first day [there shall be] a holy assembly; you must not do any {regular work}.
Numbers 28:16
" 'On the fourteenth day of the first month [is] the Passover for Yahweh.