"Preparation for the Sabbath At the very beginning of the fourth commandment the Lord said: “Remember.” He knew that amid the multitude of cares and perplexities man would be tempted to excuse himself from meeting the full requirement of the law, or would forget its sacred importance. Therefore He said: “Remember the Sabbath day, to keep it holy.” Exodus 20:8 . 6T 353"
"Remember the sabbath day, to keep it holy."
Ellen White directly references Exodus 20:8 in this passage.
"All through the week we are to have the Sabbath in mind and be making preparation to keep it according to the commandment. We are not merely to observe the Sabbath as a legal matter. We are to understand its spiritual bearing upon all the transactions of life. All who regard the Sabbath as a sign between them and God, showing that He is the God who sanctifies them, will represent the principles of His government. They will bring into daily practice the laws of His kingdom. Daily it will be their prayer that the sanctification of the Sabbath may rest upon them. Every day they will have the companionship of Christ and will exemplify the perfection of His character. Every day their light will shine forth to others in good works. 6T 353.4"
"Remember the sabbath day, to keep it holy."
EGW references the commandment to remember the Sabbath, which is found in Exodus 20:8.
"Moreover also I gave them my sabbaths, to be a sign between me and them, that they might know that I am the Lord that sanctify them."
EGW references the Sabbath as a sign between God and His people, and that God sanctifies them, which is directly stated in Ezekiel 20:12.
"Ye shall keep my sabbaths, and reverence my sanctuary: I am the Lord."
Both passages emphasize the importance of keeping the Sabbath and reverence for God. While not a direct quote, the principle is the same.