Common scripture in this type of argument. The Sabbath was part of the mosaic Law, which was done so that the Jews would have some sort of guidelines to follow since they didn't have the Bible. A big part of this Law is reconciling your sins with God. The Mosaic Law was done away with by Jesus who replaced it with, "Love God with all your whole mind, your whole body and your whole mind. Love thy Neighbor as oneself." These aren't word for word what they say as I'm pulling it from memory but it says it along those lines. If you wish, I can pull up the exact scriptures if you want to be petty.