Reference

Ezekiel 45:21

In the first month, in the fourteenth day of the month, ye shall have the passover, a feast of seven days; unleavened bread shall be eaten.
19

And the priest shall take of the blood of the sin offering, and put it upon the posts of the house, and upon the four corners of the settle of the altar, and upon the posts of the gate of the inner court.

20

And so thou shalt do the seventh day of the month for every one that erreth, and for him that is simple: so shall ye reconcile the house.

21

In the first month, in the fourteenth day of the month, ye shall have the passover, a feast of seven days; unleavened bread shall be eaten.

22

And upon that day shall the prince prepare for himself and for all the people of the land a bullock for a sin offering.

23

And seven days of the feast he shall prepare a burnt offering to the Lord, seven bullocks and seven rams without blemish daily the seven days; and a kid of the goats daily for a sin offering.

Counter-Arguments

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

First Day of the Week

The verse specifies the "fourteenth day of the month" for the Passover, not the "first day of the week." There is no mention of a weekly cycle or any specific day of the week in this text.

Seventh-Day Sabbath

The verse explicitly describes the Passover feast and the eating of unleavened bread, neither of which are directly connected to the concept of a "Seventh-Day Sabbath" or a day of rest.