“Revelation 1:10 — ‘The Lord’s Day’ refers to Sunday, so that’s when SABBATH is.”
A. Revelation 1:10–11 — what the text actually says
Revelation 1:10–11 (KJV) — “I was in the Spirit on the Lord’s day, and heard behind me a great voice, as of a trumpet, 11 Saying, I am Alpha and Omega, the first and the last: and, What thou seest, write in a book, and send it unto the seven churches which are in Asia…”
John names the day as the Lord’s; the verse itself doesn’t identify it as Sunday. So we examine Scripture with Scripture.
B. Old Testament usage: “My holy day” (Isaiah 58:13–14)
What day does Isaiah call the Lord’s day?
Isaiah 58:13–14 (KJV) — “If thou turn away thy foot from the Sabbath, from doing thy pleasure on my holy day; and call the Sabbath a delight, the holy of the Lord, honourable… 14 Then shalt thou delight thyself in the LORD…”
God explicitly calls the Sabbath “my holy day.”
C. New Testament witness: “Lord of the Sabbath”
Matthew 12:8 — “For the Son of Man is Lord even of the Sabbath.”
Mark 2:28 — “Therefore the Son of Man is Lord also of the Sabbath.”
Luke 6:5 — “The Son of Man is Lord also of the Sabbath.”
In the Gospels, the day identified with the Lord is consistently the Sabbath, not Sunday.
D. Return to Rev 1:10 — which “Lord’s day” fits?
Reading Revelation 1:10 in light of Isaiah 58 and Jesus’ statements:
Revelation 1:10 (KJV) — “I was in the Spirit on the Lord’s day, and heard behind me a great voice…”
Conclusion: Scripture defines the Lord’s Day as the Sabbath (the day He calls “my holy day” and over which Messiah is “Lord”). Therefore, Revelation 1:10 does not establish Sunday sanctity; it aligns with the Sabbath already called the Lord’s day in Scripture.