It may seem like an extremely simple question. Sunday is the Lord’s Day. Of course we go to Church on Sunday.

And yet, when I asked someone recently about how our Sunday obligation related to the Sabbath, they didn’t know how to answer. You see, in the Old Testament, God ordained the 7th day the day of rest. After six days of working, we were to observe the Sabbath just as the Lord had. That day was not Sunday. The seventh day is actually Saturday.

So why do we celebrate on Sunday? Are we ignoring God’s commandment by working on Saturdays? And what gave us the right to change the day? In this week’s Catholicism In Focus, I answer all of these questions and more.