Exodus 12:16; Leviticus 23:36

16 On the first day you shall hold a xholy assembly, and on the seventh day a holy assembly. No work shall be done on those days. But what everyone needs to eat, that alone may be prepared by you.

36 For seven days you shall present food offerings to the Lord. qOn the eighth day you shall hold a holy convocation and present a food offering to the Lord. It is a rsolemn assembly; you shall not do any ordinary work.