Question: Why do we call Sunday, Lord’s Day? Does not Scripture tell us not to esteem one day above another? (Gal. 4:10; Col. 2:16).
Answer: In Christianity we have no days to keep as they did under the law, is the answer to these scriptures.
In the Word of God the days have no name—as Sunday or Monday. We have numbers instead. The seventh day was given to Israel as the Sabbath, the sign or seal of the covenant (Ex. 31:13-17).
It was never given to Gentiles to observe, except those who settled among the Israelites in the land of Caanan.
When Christianity began, it gave us the first day of the week, because the Lord Jesus Christ rose from the dead on that day; the Holy Spirit came to dwell on that day; the first gospel sermon was preached that day, and as time went on, the Christians came together to break bread on that day (Acts 20:7), and the Apostle John, while alone in the isle of Patmos, gave to it, by the Holy Spirit’s inspiration, its name when he wrote, “I was in the Spirit on the Lord’s day.”
We have no rules or commandments from the Lord how to observe it. That is left to those who truly love Him, to give Him the first place. The statutes of the country in which we live have made it a holiday, and what better could Christians do than to use it for the One who has loved them and given Himself for them?
Romans 14:1-8 leaves everyone free to please the Lord as he knows best and does not put us under law to observe days. It is a great thing for us to please the Lord and devote our hearts and time to how best to glorify Him.