Numbers 28:18
And on the first day there is to be a holy assembly; you must do no ordinary work on it.
Exodus 12:16
On the first day there will be a holy convocation, and on the seventh day there will be a holy convocation for you. You must do no work of any kind on them, only what every person will eat -- that alone may be prepared for you.
Leviticus 23:7-8
On the first day there will be a holy assembly for you; you must not do any regular work.
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