'First Day of the Week' in the Bible

Now on the first day of the week Mary Magdalene cometh early in the morning, while it was yet dark, to the sepulchre, and seeth the stone taken away from the sepulchre.

Now the same day at evening, being the first day of the week, and the doors where the disciples were being shut, for fear of the Jews, Jesus came and stood in the midst, and saith unto them, Peace be to you.