"I gave them my decrees, and made known to them my laws, for the man who obeys them will live by them." Ezekiel 20:11
God gave us laws and decress, not to be a burden to us, but through we are able to live. When Jesus came 2000 years ago he set the example that we should follow, in order to know the way to eternal life..
"I have set you an example that you should do as I have done for you."
Jesus Christ set the example by keeping the Sabbath day (Saturday) and eating the Passover which gives us eternal life. These are commands that God gave us and whoever obeys these laws and decrees will live by them, and not just this life on earth, a far greater life, eternal life.
However, nowadays churches are following decress and laws that weren't given to us by God, rather by men, this is why apostle Paul warned the churches when he said:
"For if someone comes to you and preaches A Jesus other than The Jesus we preached, or if you receive a different spirit from the one you received, or a different gospel from the one you accepted, you put up with it easily enough." 2 Corinthians 11:4
Here, apostle Paul mentions two Jesus'. "A" Jesus and "The" Jesus.
So how can someone tell the difference? Same name, what distinguishes one from the other?
A Jesus, claims to follow the ways of God, when in reality are just following teachings of men. Though the name is there, the truth is not. (ie: Sunday worship and Communion)
The Jesus taught us to keep the Passover because it leads to eternal life(Matt 26:17-28) and set the example of Remembering the Sabbath day because this is the day that God gave us as a sign between us and God, that God may know that we are God's people..
"Also I gave them my Sabbaths as a sign between us, so that they would know I the Lord made them holy." Exekiel 20:12
Jesus Christ set the example and followed the commands of God just as we should follow, for no other reason other than it leads to eternal life, this is God's promise to us. Those who follow, will live.