Have a friend that told me pick a day for the Sabbath he was Catholic. Have another friend that is a member of the Seventh day Adventist church told me the Sabbath is Saturday and not Sunday because the Catholic church had changed the day.
Thanks, John
The Sabbath is the seventh day of the week.
The Christian day of worship, since the time of the apostles, is the first day of the week which the Church has historically called the Lord's Day.
Referring to the Lord's Day as "the Sabbath" is a largely modern misconception that easily causes confusion.
The Sabbath as a day of rest for the Jews was given through the covenant God made with the Jews at Mt. Horeb in Sinai. It wasn't given as a weekly day of worship, but as a day of rest. Later on Jews began to assemble together for worship in places of assembly (synagogues) on the Sabbath, a tradition which appears to have begun during or sometime after the Babylonian Captivity.
Christians do not have a Sabbath, except a spiritual Sabbath--Jesus Christ Himself. The gathering for worship on the first day of the week was not a replacement for the Sabbath or a new Sabbath; but was probably originally for very practical reasons:
The original Christians were Jews and continued to observe Jewish practices, they continued to worship at the Temple in Jerusalem, they met with other Jews for worship at the synagogue, etc. They didn't see a reason to stop doing any of this because they didn't stop being Jews after Jesus rose from the dead. Additionally, they also met together in homes on a regular bases, for explicitly Christian purposes, such as celebrating the Eucharist. It would make sense that they would do this on the day following the Sabbath, the first day of the week, and the significance of that day was already importance since Christ rose from the dead on the first day of the week.
As Gentiles were added to the Church, Christian communities became increasingly mixed with both Jews and Gentiles. Gentiles couldn't go to the synagogue obviously, but they were part of the post-Sabbath fellowship. With the early Jewish Christians increasingly becoming unwelcome in the synagogues, and with a growing Gentile Christian population, it wouldn't have taken long until the entirety of Christian communal worship happened entirely independent of the synagogue, on the first day of the week. Thus the familiar liturgy of the synagogue became the Christian Liturgy of the Word, and the explicitly Christian worship (e.g. the Eucharist) became the Christian Liturgy of the Altar. These two parts being the traditional, historical Liturgy of the Christian Church. The Liturgy of the Word is marked by prayers, the singing of hymns, Scripture readings, and instruction in the form of a sermon or homily; the Liturgy of the Altar is most obviously marked by the celebration of the Eucharist. And this is what Christian worship has looked like since.
We gather on the first day of the week, historically, because this is the day Christians have always gathered for worship. It's not the Sabbath, it's the Lord's Day. Christians are under no obligation to observe the Jewish Sabbath.
-CryptoLutheran