“Remember the Sabbath day by keeping it holy. Six days you shall labor and do all your work, but THE SEVENTH DAY IS A SABBATH TO THE LORD YOUR GOD. On it you shall not do any work. . . . For in six days the LORD made the heavens and the earth, the sea, and all that is in them, but he RESTED on the seventh day. Therefore the LORD BLESSED the Sabbath day and MADE IT HOLY.”
—Exodus 20:8-11.

When God created our world, He set apart “the seventh day” as “the Sabbath to the Lord” by three divine acts: (1) “On the seventh day he rested from all his work,” (2) He “blessed the Sabbath day,” and (3) He “made it holy” (Genesis 2:1-3). Again at Sinai when He gave the Ten Commandments, God reiterated these same truths.

When God gave the Ten Commandments to His people, He also made it clear that no human being should revise or edit the instruction from His holy lips.

“DO NOT ADD to what I command you and DO NOT SUBTRACT from it, but keep the commands of the LORD your God that I give you.”
—Deuteronomy 4:2.

God Himself pledges not to alter His commands:

“I WILL NOT violate my covenant or ALTER WHAT MY LIPS HAVE UTTERED.”
—Psalm 89:34.

The Bible is clear that God did not change the Sabbath from the seventh to the first day of the week.