'First Day of the Week' in the Bible

And very early on the first day of the week, they came to the tomb at the rising of the sun.

{The remaining twelve verses, according to Tischendorf and others, made originally no part of Marks Gospel. As the passage was added very early, however, since it is referred to by Irenaeus in the latter part of the second century, it is here given, as an appendix.} [And having risen early, on the first day of the week, he appeared first to Mary the Magdalene, out of whom he had cast seven demons.