'First Day' in the Bible

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

In the evening of the same day--the first day of the week-- after the doors of the room, in which the disciples were, had been shut for fear of the Jews, Jesus came and stood among them and said: "Peace be with you";