The New Testament has ample evidence that the seventh day Sabbath is no longer a requirement.
- Rom. 14:5-6, "One man regards one day above another, another regards every day alike. Let each man be fully convinced in his own mind. 6 He who observes the day, observes it for the Lord, and he who eats, does so for the Lord, for he gives thanks to God; and he who eats not, for the Lord he does not eat, and gives thanks to God."
The entire section of
Rom. 14:1-12 is worth careful study. Nevertheless, the instructions here are that individuals must be convinced in their own minds about which day they observe for the Lord. If the seventh day Sabbath were a requirement, then the choice would not be man's, but God’s.
- Col. 2:16-17, "Therefore let no one act as your judge in regard to food or drink or in respect to a festival or a new moon or a Sabbath day— 17 things which are a mere shadow of what is to come; but the substance belongs to Christ."
Notice here that time sequence mentioned. A festival is yearly. A new moon is monthly. A Sabbath is weekly. No one is to judge in regard to this. The Sabbath is defined as a shadow, the reality is Jesus. Jesus is our Sabbath.
- Acts 20:7, "And on the first day of the week, when we were gathered together to break bread, Paul began talking to them, intending to depart the next day, and he prolonged his message until midnight."
The first day of the week is Sunday, and this is the day the people gathered. This passage can easily be seen as the church meeting on Sunday. It has two important church functions within it: breaking bread (communion) and a message (preaching). Additionally, Luke did not use the Jewish system of counting days: sundown to sundown. He used the Roman system: midnight to midnight. This is a subtle point that shows the Jewish Sabbath system was not the one utilized by Luke.
- 1 Cor. 16:1-2, "Now concerning the collection for the saints, as I directed the churches of Galatia, so do you also. 2 On the first day of every week let each one of you put aside and save, as he may prosper, that no collections be made when I come."
Notice here that Paul is directing the churches to meet on the first day of each week and put money aside. It would seem that this is tithing. So, the instructed time for the church to meet is Sunday. Is this an official worship day set up by the church? You decide.
- Rev. 1:10-11, "I was in the Spirit on the Lord’s day, and I heard behind me a loud voice like the sound of a trumpet, 11saying, "Write in a book what you see, and send it to the seven churches: to Ephesus and to Smyrna and to Pergamum and to Thyatira and to Sardis and to Philadelphia and to Laodicea."
The New Bible Dictionary says regarding the term, ‘The Lord’s Day’ in
Revelation 1:10: "This is the first extant occurrence in Christian literature of
τῇ κυριακῇ ἡμέρᾳ, "ta kuriaka hamera". The adjectival construction suggests that it was a formal designation of the church’s worship day. As such it certainly appears early in the 2nd century (Ignatius,
Epistle to the Magnesians, 1. 67).
In many churches today, the term "The Lord’s Day" is used to designate Sunday, the same as it was in the second century.
I hope this is evidence enough to show you that the Bible does not require that we worship on Saturday. If anything, we have the freedom (
Rom. 14:1-12) to worship on the day that we believe we should. And, no one should judge us in regard to the day we keep. We are free in Christ, not under law (
Rom. 6:14).
That is from CARM and is a great explanation of the way the new testament speaks of the sabbath.