Reference

Numbers 29:1

And in the seventh month, on the first day of the month, ye shall have an holy convocation; ye shall do no servile work: it is a day of blowing the trumpets unto you.
1

And in the seventh month, on the first day of the month, ye shall have an holy convocation; ye shall do no servile work: it is a day of blowing the trumpets unto you.

2

And ye shall offer a burnt offering for a sweet savour unto the Lord; one young bullock, one ram, and seven lambs of the first year without blemish:

3

And their meat offering shall be of flour mingled with oil, three tenth deals for a bullock, and two tenth deals for a ram,

Counter-Arguments

The strongest case that this verse does not belong in this theme.

First Day of the Week

The verse explicitly mentions the "first day of the month," not the "first day of the week." There is no linguistic or contextual indication that "first day of the month" should be interpreted as "first day of the week."

Sabbath at Creation

This verse describes a specific holy convocation on the first day of the seventh month, characterized by trumpet blowing and abstention from servile work, but it does not mention creation or God resting on the seventh day. It refers to a specific festival, not the weekly Sabbath or its origins.