In the closing book of the Holy Classics (Revelation 14:6) we are warned that when "the hour of judgment is come" at the end of the present age, THEN we surely shall need to be found worshipping That God Who made the Earth and all Mankind, as CREATOR OF ALL THINGS!

Now faithful observance of the 7th-day Sabbath is badge of just such worship,--according to the  Divine statement itself, just now quoted in the above paragraph from Exod. 20:8-11.
The full passage tells us this takes in our "son" and our "daughter".  This means it is not enough that merely the head of the family comply with this Divine Requirement.  IF THEY ARE LIVING WITH US, it must extend to sons and daughters.
"Thy manservant and thy maid-servant" tells us it is not sufficient if the entire family observe the Sabbath but hire others to work on this day.  This is forbidden.
"Thy cattle" means we cannot loan a horse to a neighbor to plow a garden or work for him, though he be a non-Sabbath-keeper, on this day.
And "the stranger that is within thy gates" means those who are only guests in our home,--must observe the 7th-day Sabbath while in our home!
Oh, how clean-sweeping!  We must be known and read of all men that we are not in darkness as to our origin, whence we came, whither we go, and WHO is God,--Jehovah, the Creator, the Giver of the Bible as written in the Book of Genesis!
The prophet Ezekiel records further words of  Jehovah "I gave them MY Sabbaths" (they belong to Him, they are not Jewish, racial or dispensational) "to be a sign between Me and them, that they might know that I am Jehovah that SANCTIFIETH them." Ezek. 20:12
Observance of HIS Sabbaths are a seal that we belong to the one that Sanctifies--our SAVIOR.
"In it, thou shalt not do any work",--is interpreted by Jesus Christ (the one only God Himself come in male human flesh veil) when people in His day tried to pretend that nothing at all could be done on the Sabbath, on any Sabbath.  He said it is lawful to do works of two types on Sabbath Days:  Works of Mercy, and, Works of Necessity.
"Necessity" does NOT mean, "It is necessary for me to make a living--therefore I shall clerk in a store, or plow my garden on the Sabbath", but He illustrated what is meant by necessity.
We read a "Christian" paper's answer to a woman about keeping the Sabbath.  The editor told her if she would keep the Sabbath as the Scriptures required it to be kept, she could not pick up a pin or open a letter.  This is not "work".