/* Yes */ ====Yes====
It is one of the Christian ten commandments.
In the Bible, Moses collects ten commandments (refer to Exodus chapter 20). These are supposed to be kept by Christians. One of these commandments is to never work on the sabbath (which for Christians is Sunday but for other relligions Saturday). The ten commandment for Christians is filled with the most important rules to keep and ignoring the sabbath rule is breaking the fourth commandment.
/* Yes, all Christians should keep Sabbath, not only Jews */ ====Yes====
Yes, it is indeed one of the Ten Commandments. The Sabbath command is of course one of the Ten Commandments, but unlike the others, was given in the beginning to Adam and Eve - before there was a nation such as the Jews. If you read the book of Revelation, the Sabbath will be kept long after the end of this world as we know it. Sabbath is a memorial of creation, something most people, even Christians, have forgotten. The fourth commandment starts with "Remember"!!! We have failed!
Matt. 5:17-18 Think not that I am come to destroy the law or the prophets: I am not come to destroy, but to fulfil. For verily I say unto you, TILL HEAVEN AND EARTH PASS, ONE JOT OR ONE TITTLE SHALL IN NO WISE PASS FROM THE LAW, TILL ALL BE FULFILLED.
1 John 1: 6 And this is love - that we walk after His commandments. This is the commandment, that, as ye have HEARD FROM THE BEGINNING, ye should walk in it.
Rev 12:14 Here is the patience of the saints: here are they that keep the commandments of God, and the faith of Jesus.
In the Bible, both Jesus and Paul say the sabbath is not required to be kept.
Paul says not to let any man judge you in your observance of Sabbath days. (see Col. 2:16). He also says that these are a shadow of things to come, but the reality is Christ. Furthermore, in Matthew 15:19, Jesus makes a list of the things which defile a man, lining up with nine of the Ten Commandments, but not the Sabbath.
Actually, it is one of the Jewish Ten Commandments.
It is made quite clear in the New Testament that the Old Testament law is no longer required to be kept. I am sure every Christian here agrees with this, because if they did not, they would be sacrificing animals. Therefore, it logically follows that if Old Testament law need not be kept, and a law appears only in the Old Testament, it is unnecessary to keep it.