[Mark 2:27-28; RSV]. And claiming authority over it It is true that the Catholic Church through the authority of Christ replaced the Hebrew Sabbath (Saturday) with the Lord's Day (Sunday); however ...

If the Sabbath was Saturday ... and the eighth begins the new creation (cf. Catechism of the Catholic Church 349). The work of creation culminates in the work of our redemption.

Remember the Sabbath day by keeping it holy. Six days you shall labour and do all your work, but the seventh day is a Sabbath to the Lord your God. On it you shall not do any work, neither you ...