Eccl. 12:13,14:
Let us hear the conclusion of the whole matter: Fear God, and keep his commandments; for this is the whole duty of man.
---He never so claimed the first day, but gave it to man for labor.
---He blessed and sanctified the seventh day. He neither blessed nor sanctified the first day.
---He commanded that the seventh day be kept holy. He never commanded to keep the first day.
There is but one commandment in the Bible for a weekly Sabbath, and that says the seventh day."
Joseph Waggoner