Leviticus 23:21
And you shall proclaim on the selfsame day, that it may be an holy convocation to you: you shall do no servile work therein: it shall be a statute for ever in all your dwellings throughout your generations.
Torrey's Topical Textbook—AKJV

Numbers 28:26
Also in the day of the first fruits, when you bring a new meat offering to the LORD, after your weeks be out, you shall have an holy convocation; you shall do no servile work:
Torrey's Topical Textbook—AKJV