The Church of God, that has received the Second Coming Christ Ahnsahnghong, keeps the Sabbath on Saturday, according to the Bible. The seventh-day Sabbath is the day on which God rested from creating the heavens and the earth. Most Christians are mistaken as to what day the seventh-day Sabbath is, believing it to be Sunday, even though the Bible testifies that the Sabbath is Saturday. And they do not keep the Sabbath day, being bound to their customs, even though they realize that the Sabbath is actually Saturday.

The Bible warns us not to add or subtract even the smallest letter from the Bible.

Rev. 22:18-19 『I warn everyone who hears the words of the prophecy of this book: If anyone adds anything to them, God will add to him the plagues described in this book. And if anyone takes words away from this book of prophecy, God will take away from him his share in the tree of life and in the holy city, which are described in this book.』