Why seven(7) days??????

Sunday....Gen.1:4-5.....Monday....Gen.1:6-8.....Tuesday....Gen.1:9-13......Wednesday....Gen.1:14-19....Thursday...Gen.1:20-23....Friday(Good Friday)....Gen.1:23-31....Sabbath...Gen.2:1-3...NO Jews...Just Adam and Eve(Mankind)....Matt.15:8-9....Ex.20:8-11...Mal.3:6-8