'First Day' in the Bible

And on the first day of unleavened bread, when they killed the Passover, his disciples say to him, Where wilt thou that we go and prepare, that thou mayst eat the passover?

And very early in the morning, the first day of the week, they come to the sepulchre, 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 devils.