'First Day' in the Bible

And the first day of unleavened bread, when they killed the passover, his disciples said unto him, Where will you that we go and prepare that you may eat the passover?

And very early in the morning the first day of the week, they came unto the sepulcher at the rising of the sun.

Now when Jesus was risen early the first day of the week, he appeared first to Mary Magdalene, out of whom he had cast seven demons.