Ezekiel 20:10-12

So the Lord led the Israelites out of Egypt and into the wilderness. At Mount Sinai He gave them statutes and ordinances that would result in their welfare if they obeyed them, namely, the Mosaic Law. He also gave them the Sabbath Day as a sign of the special relationship and blessing that they enjoyed because He had chosen them. By observing the Sabbath the Israelites demonstrated their uniqueness among the nations, their sanctification unto Yahweh (Exodus 20:8-11; Exodus 31:13-17). The Sabbath was a dual sign to the Israelites. It reminded them of Yahweh’s creation of the cosmos (Exodus 20:11) and of His creation of their nation (Deuteronomy 5:14-15). It was the central sign of the Old Covenant (Isaiah 56:2; Isaiah 56:4).