'Week' in the Bible

On the first day of the week, very early, while it was still dark, Mary of Magdala came to the tomb and saw that the stone had been removed from it.

On that same first day of the week, when it was evening and, for fear of the Jews, the doors of the house where the disciples were, were locked, Jesus came and stood in their midst, and said to them, "Peace be to you!"

A week later the disciples were again in the house, and Thomas was with them, when Jesus came--though the doors were locked--and stood in their midst, and said, "Peace be to you."