“Speak thou also unto the children of Israel, saying, Verily my sabbaths ye shall keep: for it is a sign between me and you throughout your generations; that ye may know that I am the LORD that doth sanctify you.”
King James Version (KJV)
31:13 It is a sign between me and you - The institution of the sabbath was a great instance of God's favour, and a sign that he had distinguished them from all other people: and their religious observance of it, was a great instance of their duty to him. God, by sanctifying this day among them, let them know that he sanctified them, and set them apart for his service, otherwise he would not have revealed to them his holy sabbaths to be the support of religion among them. The Jews by observing one day in seven, after six days labour, testified that they worshipped the God that made the world in six days, and rested the seventh; and so distinguished themselves from other nations, who having first lost the sabbath, the memorial of the creation, by degrees lost the knowledge of the creator, and gave the creature the honour due to him alone.