We should obey the words of God absolutely. So should we do "Remember the Sabbath day by keeping it holy" as God said so.

Sunday is not in the Bible. Sabbath is Lord's day. Let's keep the Sabbath day which is Saturday!!

Because the seventh day of a week is Saturday, we must keep the Sabbath on that day. We can never change that day without God’s permission. Let’s worship on God’s holy day, on Saturday, and receive eternal blessings.

According to the biblical evidence as the above comment mentioned, the seventh day, Sabbath is Saturday. In order to receive blessings, we must do what the Bible said.

It is very important to know which day is the Sabbath day. God promised us that he will give us blessings and make us holy through the Sabbath. If we worship God on wrong day, we will not receive these promised blessings.
Then, Which is the Sabbath day in Bible?. It is Saturday. not Sunday as above post. Sunday is just next day from Saturday. Besides, when we keep Sunday, automatically, we will worship Sun god. That is the scheme of Satan to let people worship Sun god. So, those who want to get salvation have obligation to know sabbath through Bible.

Sunday service is a man-made teaching. It's not based on the Bible. We should worship on the Sabbath day which is Saturday based on the current calendar system. We can receive blessings from God when we keep the Sabbath day.

Exodus 31:13 Say to the Israelites, ‘You must observe my Sabbaths. This will be a sign between me and you for the generations to come, so you may know that I am the Lord, who makes you holy.

The Sabbath is a day we must keep even in this age.

Today, only the World Mission Society Church of God (WMSCOG) keeps the Sabbath day of the New Covenant (not of the Old Covenant) by following the examples of Jesus and the apostles. When we keep this day, we can recognize the true God who gives us eternal life.

The worship day in the Bible is the Sabbath day which is seventh day. When we keep the Sabbath day, we can receive the blessings of God. Let's keep the Sabbath, not Sunday worship.

Jesus said that not everyone can enter the kingdom of heaven but only those who do the will of God the Father. What is the will of God? He clearly let us know His will through His Commandments. The 4th one is "Remember the Sabbath day by keeping it holy". In respect of God's command, we must keep the Sabbath day which falls on Saturday.

Knowing the worship day is very important. We should keep the Sabbath day to worship God.

God regards those who keep His commandments as His people. We, the children of God, must keep the Sabbath as worship day.

Before WMSCOG, the Church of God, I've been mistaken the worship day of the Sabbaths for Sunday service. Now I'm given the wisdom and understanding by God Elohim; Christ Ahnsahnghong and Heavenly Jerusalem Mother, so I'm happy to attend the Church of God and worship our Heavenly Parents on every Sabbaths.