Mark 16

"1 Now when the Sabbath was past, Mary Magdalene, Mary the mother of James, and Salome bought spices, that they might come and anoint Him. 2 Very early in the morning, on the first day of the week, they came to the tomb when the sun had risen. 9 Now when He rose early on the first day of the week, He appeared first to Mary Magdalene, out of whom He had cast seven demons. "

This a good passage to discuss which day the Sabbath is or isn't. There were disputes in regards to the different calendars to decide which Sunday to be legally set as Easter (Ostern), however, there has never been a dispute over whether Easter falls on a Sunday. As we all know, there is no dispute among Christians that Easter is Sunday, which is the day that Jesus resurrected. In these verese, we can see that the day that Jesus arose was the first day of the week. Putting these 2 together with a little mathimatical concept, if a=b and b=c then a=c, then first day of the week=Sunday. Now then, this passage mentioned that the Sabbath was past, and it was the first day of the week. It is then very logical to say that Sabbath is not on the day that Jesus resurrected, therefore, Sabbath is not the first day of the week. If Sunday is the first day of the week, then the day before that is logically Saturday.