Let's see the reason that we should keep the Sabbath.

Eze 20:10~12 - Therefore I led them out of Egypt and brought them into the desert. I gave them my decrees and made known to them my laws, for the man who obeys them will live by them. Also I gave them my Sabbaths as a sign between us, so they would know that I the LORD made them holy.

We should God's laws to live. God's laws it the laws to live. God gave the law 'Sabbath' to people to know Him and made it as a sign between them.

Eze 20:19~22 - I am the LORD your God; follow my decrees and be careful to keep my laws. Keep my Sabbaths holy, that they may be a sign between us. Then you will know that I am the LORD your God.' " 'But the children rebelled against me: They did not follow my decrees, they were not careful to keep my laws-although the man who obeys them will live by them-and they desecrated my Sabbaths. So I said I would pour out my wrath on them and spend my anger against them in the desert. But I withheld my hand, and for the sake of my name I did what would keep it from being profaned in the eyes of the nations in whose sight I had brought them out.

God spend His anger when people don't keep the Sabbath. Therefore we must keep the Sabbath to receive the blessing and salvation. If people don't keep the Sabbath they will be punished with the fire in the last days.

Mal 4:1 - Surely the day is coming; it will burn like a furnace. All the arrogant and every evildoer will be stubble, and that day that is coming will set them on fire,' says the LORD Almighty. 'Not a root or a branch will be left to them.

Every evildoer will be stubble. Who are evildores?

Ne 13:17 - I rebuked the nobles of Judah and said to them, 'What is this wicked thing you are doing-desecrating the Sabbath day?

This is wicked thing people are doing desecrating the Sabbath day.

So we should keep the Sabbath day!!!