One can in truth speak of sabbaths in the plural only as one can speak of many gods. “There is no god but one. For though there be that are called gods, whether in heaven or on earth; as there are gods many and lords many; yet to us there is one God, the Father, of whom are all things, and we through Him; and one Lord, Jesus Christ, through whom are all things, and we through Him.” 1 Corinthians 8:5, 6. So, though there be various sabbaths, so-called, there is but one true Sabbath, the Sabbath of the Lord.THSA 1.1