(Matthew 22:36-40) "Master, which is the great commandment in the law? {37} Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. {38} This is the first and great commandment. {39} And the second is like unto it, Thou shalt love thy neighbour as thyself. {40} On these two commandments hang all the law and the prophets."

There are the only 2 commandments which the law and prophets hang on.

All the Old Testament is a blueprint on how to live a righteous life, but none of them will send you to hell for it when you're living under Grace.

(John 7:19-24) "Did not Moses give you the law, and yet none of you keepeth the law? Why go ye about to kill me? {20} The people answered and said, Thou hast a devil: who goeth about to kill thee? {21} Jesus answered and said unto them, I have done one work, and ye all marvel. {22} Moses therefore gave unto you circumcision; (not because it is of Moses, but of the fathers;) and ye on the sabbath day circumcise a man. {23} If a man on the sabbath day receive circumcision, that the law of Moses should not be broken; are ye angry at me, because I have made a man every whit whole on the sabbath day? {24} Judge not according to the appearance, but judge righteous judgment."

Jesus healed on the sabbath day, does that mean he broke the commandment because he should have been resting? Hence why he says judge righteous judgment and not according to appearance. If SDA worship and rest on a Saturday, and other Christians worship and rest on a Sunday, if we judge by righteous judgment, can we say those Christians worshiping on a Sunday are wrong for doing so and are going to hell?

And what does the ten commandments say exactly?

(Exodus 20:8) "Remember the sabbath day, to keep it holy."

A sabbath day is a day of rest & worship. So we are commanded to keep one day for rest & worship. Now it doesn't say specific times or days we should do it on, there is no clarification here. If the Bible didn't clarify this, then we can assume we had to do exactly like the Jews, but the Bible does clarify clearly in the New Testament with the verse I posted. I will post the next verse also.

(Colossians 2:16-17) "Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days: {17} Which are a shadow of things to come; but the body is of Christ."

We shouldn't judge, because these are only a shadow of things to come. We are living under Grace at the moment, we can't do everything right, Jesus said not one person kept the law. But when we go to heaven and get a new body, God will write the laws into our hearts.

I'll leave with this. I was very into prophecy before getting saved, and when I got saved and found out there were loads of prophecy in the Bible, I came onto SDA teachings and also thought I had to keep the sabbath exactly as the Jews did, and that Sunday laws were the mark of the beast. So I'll pray for you, and you also should pray to God on these things to reveal what is true. God Bless.