"The sophistry in regard to the world's being created in an indefinate period of time is one of satan's falsehoods. God speaks to the human family in language they can comprehend. When the Lord declares that He made the world in six days and rested on the seventh day, He means the day of twenty-four hours, which He has marked off by the rising of the sun. God would not present the death sentence for a disregard of the Sabbath unless He had presented before men a clear understanding of the Sabbath." Testimonies to Ministers p.135,136 E.G.W.
Thus the heavens and the earth were finished, and all the host of them. And on the seventh day God ended his work which he had made; and he rested on
the seventh day from all his work which he had made. And God blessed the seventh day, and sanctified it: because that in it he had
rested from all his work which God created and made.
Genesis 2:1-3