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Genesis 2:3
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 2:3)
God blessed the seventh day.
An explanation of the meaning and importance of this day of rest is added. Here the Sacred Record closely relates the weekly Sabbath to God’s work of creation and His resting on the seventh day, just as the fourth commandment does. The blessing on the seventh day implied that it was thereby declared to be a special object of divine favor and a day that would bring blessing to His creatures.
And sanctified it.
 The act of sanctification consisted in a declaration that the day was holy, or set apart for holy purposes. As afterward Mt. Sinai was sanctified (Ex. 19:23), or, for the time being, invested with sacredness as the residence of God, and Aaron and his sons were sanctified, or consecrated, to the priestly office (Ex. 29:44), and the year of jubilee was sanctified, or devoted, to the purpose of religion (Lev. 25:10), so here the seventh day was sanctified, and as such proclaimed to be a holy day. This act of blessing the seventh day and declaring it holy was done in the interest of the human race, for whose benefit the Sabbath day was instituted. The weekly seventh-day Sabbath has frequently been considered an institution of the Jewish dispensation, but the Inspired Record declares that it was instituted more than two millenniums before the first Israelite (a descendant of Jacob-Israel) was born. We have, furthermore, the word of Jesus declaring, “The sabbath was made for man” (Mark 2:27), which indicates clearly that this institution was not ordained for the Jews only but for all mankind as well.
Because that in it he had rested.
God could have had no higher reason for enjoining upon man rest on the seventh day than that by so resting man might enjoy the opportunity of reflecting upon the love and goodness of his Creator, and so become like Him. As God worked through six days and rested on the seventh, so man should toil through six days and rest on the seventh. This weekly Sabbath is a divine institution given to man by God, the Creator, and its observance is required by God, the Lawgiver. For man, therefore, to withhold any part or all of this holy time is to be guilty of disobedience against God and robbery of God as the original proprietor of man’s powers and of his time. As an institution of God’s appointing, the Sabbath deserves our honor and esteem. Neglect to render this, God counts a sin.
 The Sabbath calls for abstention from common bodily labor and for the devotion of mind and heart to holy things. The Israelites were admonished to use it for holy convocations (Lev. 23:3). The Gospels attest that it was so used by Christ and the apostles (Luke 4:16; Acts 17:2; 18:4; etc.), and that it should continue to be observed by Christians after the completion of Christ’s earthly ministry (Matt. 24:20).
 The fact that the Sabbath will still be celebrated in the new earth as a day of worship (Isa. 66:23) is a clear indication that God never intended to have its observance transferred to another day. The weekly Sabbath day is the memorial of creation, reminding man each week of God’s creative power and of how much he owes to a merciful Creator and Provider. A rejection of the Sabbath is a rejection of the Creator, and opens wide the door for all manner of false theories. “It is a constant witness to His existence and a reminder of His greatness, His wisdom, and His love. Had the Sabbath always been sacredly observed, there could never have been an atheist or an idolater” (PP 336).