Most people today believe the Sabbath is Sunday. This belief is widespread, deeply ingrained in modern Christianity, and rarely questioned. However, when we examine the Bible itself, the evidence points clearly and consistently to the Sabbath being Saturday — the seventh day of the week — not Sunday.

Sunday Worship and Church Authority, What the Catholic Church Admits - Link here.

The Sabbath Was Established at Creation

The Sabbath did not originate with Moses or Israel. It was established by God at creation:

“And on the seventh day God ended His work which He had done, and He rested on the seventh day… Then God blessed the seventh day and sanctified it.” (Genesis 2:2–3)

God blessed and sanctified a specific day — the seventh day — long before any religious system existed.

The Sabbath Commandment Names the Day

The Fourth Commandment leaves no ambiguity:

“Remember the Sabbath day, to keep it holy… the seventh day is the Sabbath of the LORD your God.” (Exodus 20:8–10)

The Bible does not say “one day in seven” or “a symbolic day.” It specifically identifies the seventh day.

When Does the Sabbath Begin? Sunset to Sunset

According to Scripture, a biblical day begins at sunset, not midnight:

“And the evening and the morning were the first day.” (Genesis 1:5)

For this reason, the Sabbath begins at sunset on Friday and ends at sunset on Saturday. In biblical times, sunset was commonly understood to occur around the sixth hour of the evening — roughly what we would call 6:00 PM, depending on the season.

Jesus Observed the Seventh-Day Sabbath

Jesus never changed the Sabbath:

“And as His custom was, He went into the synagogue on the Sabbath day.” (Luke 4:16)

If the Sabbath had been changed to Sunday, Scripture would clearly say so. It does not.

The Disciples Kept the Sabbath After the Crucifixion

After Jesus’ death, His followers still observed the Sabbath:

“They rested on the Sabbath according to the commandment.” (Luke 23:56)

This occurred after the crucifixion, proving the commandment remained unchanged.

So Where Did Sunday Come From?

Sunday is never called the Sabbath in the Bible. It is always referred to as “the first day of the week.” The shift from Sabbath observance to Sunday worship happened gradually and historically — not biblically.

The Historical Shift to Sunday Worship

The major turning point occurred in the 4th century under Roman Emperor Constantine. In A.D. 321, Constantine issued a civil decree declaring Sunday a legal day of rest:

“On the venerable Day of the Sun let the magistrates and people residing in cities rest…”

This decree was political and cultural, not biblical. Sunday was already associated with sun worship in the Roman Empire, making it a convenient replacement as Christianity became institutionalized.

Sunday Was Never Made the Sabbath in Scripture

No verse in the Bible transfers the sanctity of the Sabbath from Saturday to Sunday. The change occurred through church tradition and imperial authority, not through a command from God.

Conclusion: What the Bible Actually Teaches

According to the Bible:

• The Sabbath is the seventh day • The seventh day is Saturday • The Sabbath runs from Friday sunset to Saturday sunset • Sunday was never biblically designated as the Sabbath

People may choose to worship God on any day, but when it comes to what Scripture actually teaches, the Sabbath remains exactly where God placed it — on the seventh day.