The sign between God and the children of God

In this world, there are many people who proclaim that they are God's children. 

Then do they have evidence that they are God's children?

The Bible, testifies that the children of God keep the Holy Sabbath Day.

World Mission Society Church of God is the one and only church which keeps the Sabbath day in the world!

If we are God's children let us keep the Sabbath day Holy.

God commanded to keep the seventh day as the holy feast of God.

“Speak to the Israelites and say to them: ‘These are my appointed feasts, the appointed feasts of the LORD, which you are to proclaim as sacred assemblies. ” ‘There are six days when you may work, but the seventh day is a Sabbath of rest, a day of sacred assembly. You are not to do any work; wherever you live, it is a Sabbath to the LORD… (Leviticus 23:2-3)

The Sabbath day is a sign between God and the children of God.

“Say to the Israelites, ‘You must observe my Sabbaths. This will be a sign between me and you [God and God's people] for the generations to come, so you may know that I am the LORD, who makes you holy. ” ‘Observe the Sabbath, because it is holy to you. Anyone who desecrates it must be put to death; whoever does any work on that day must be cut off from his people… (Exodus 31:13-14)

I [God] 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. (Ezekiel 20:11-12)

Those who do not keep the Sabbath day profane God, which is the evidence of false prophets.

Her priests do violence to my law and profane my holy things; they do not distinguish between the holy and the common; they teach that there is no difference between the unclean and the clean; and they shut their eyes to the keeping of my Sabbaths [they ignore the Sabbath: GNT], so that I am profaned among them. (Ezekiel 22:26)

Do you have evidence that you are the children of God?