8 But ye shall offer an offering made by fire unto the LORD seven days: in the seventh day is an holy convocation: ye shall do no servile work therein.
The immediate context of Leviticus 23 treats "holy convocation" equal to a Sabbath day whenever it is qualified by the additional words "ye shall do no servile work therein"
Yes, it is best to give up fighting what you have not and cannot disprove by God's word. Your only refuge is ridicule as you have no Biblical refuge.
Where is <<a seventh day Sabbath>>, <<in this Messanic Feast of unleavened bread>>?
I'm not speaking of the one you place there.