Rev. Alan Cairns explains the reason here:
We observe a Sabbath on the first day of each week because:
- Of apostolic example, which is authoritatively binding on Christians; and
- Scripture teaches it
- The Sabbath is one of the Ten Commandments and there is no justification to excise it from the Bible.
- God’s 7th-day rest at creation was man’s first full day of existence. Man’s first day on earth was a Sabbath day so the Sabbath goes back to creation.
- In Exodus 20, the commandment says “the seventh day,” not “the seventh day of the week.” The weekly Sabbath was a 7-day thing.
- Man’s first Sabbath was on his first full day of existence.
- There is nothing requiring the Sabbath to be kept on the 7th day of the week, although the Jews did observe this up until New Testament times.
- In the New Testament,
- Jesus was raised on the first day
- Pentecost occurred on the first day
- Paul went to Troas to worship with believers on the first day
- 1 Corinthians contains instructions for taking up collections in services on the first day of the week
- Historically, the early Christians attended synagogues on Saturday to witness and evangelise. However, they worshiped together on the first day. A change took place regarding the day of worship. Why?:
- Hebrews 4:9 – There remains a Sabbath (not the Greek word for “rest” as in the rest of the chapter).
- Hebrews 4:10 – This Sabbath is on the first day because: As God finished his creation and then instituted the Sabbath, Jesus has finished His work and entered into His rest on the first day. For that reason, there is left a keeping of the Sabbath. The creation Sabbath celebrated God’s creation work. Christ’s Sabbath, which He instituted, celebrates His finished work, His redemption work.
- Jesus finished His work and rose on the first day. We keep His Sabbath in commemoration of that. We do not keep the Jewish weekly creation Sabbath or special Sabbaths.