Although we can regard Sunday as "the Lord's day," there is NO Biblical evidence that the Sabbath switched to Sunday.
We can assemble to worship on the Lord's day to remember the resurrection, but doing so is NOT observing the Sabbath.
Either we are under the Saturday Sabbath or we are not.
I say the Christian life is the New Covenant fulfillment of the Sabbath.
In Creation, God rested the seventh day because He completed the original work of Creation.
When mankind sinned, we needed a redeemer. Christ had His work scheduled. The Sabbath, like the sacrifices, and all the Law were types and pictures of Christ, awaiting His work and completion.
Christ finished the work of redemption and then sat down (Hebrews 1:3; 10:12), which a Levitical priest never did when entering the Holy of Holies. A priest offered the sacrifice, then continued to stand and leave. Christ sat down to demonstrate that the work was complete.
Now, we are not subject to literal Sabbath day observances:
Colossians 2
16: Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
17: Which are a shadow of things to come; but the body is of Christ.
We enter into His rest:
Hebrews 4
2: For unto us was the gospel preached, as well as unto them: but the word preached did not profit them, not being mixed with faith in them that heard it.
3: For we which have believed do enter into rest, as he said, As I have sworn in my wrath, if they shall enter into my rest: although the works were finished from the foundation of the world.
9: There remaineth therefore a rest to the people of God.
10: For he that is entered into his rest, he also hath ceased from his own works, as God did from his.
GE:
“Although we can regard Sunday as "the Lord's day," there is NO Biblical evidence that the Sabbath switched to Sunday.”
On what grounds do you “regard Sunday as "the Lord's day"”?
It is “The Seventh Day Sabbath of the LORD GOD” that
ALL “Biblical evidence” regard as "the Lord's Day" because
God in Christ “the Seventh Day finished”, and
in and through Jesus Christ
“from ALL his works rested”—
who is “my Lord and my God” THE RISEN from the dead
touched by the hand of the heart touched by faith.
John 20:28.
THEREFORE:
… we assemble and worship
“on the Lord JESUS' Day” OF RESURRECTION,
and “remember the Sabbath Day BECAUSE …
… GOD, IN IT RESTED” …
… “RESTED” by having RAISED Him from the dead—
“IN THE SABBATH’S DAY”—
which very thing for God as well as us …
… is ‘observing the Sabbath Day’.
We are under God’s Law or we are under the commandments and traditions of men … for Jesus Christ is the New Covenant Fulfilment of God’s Holy Sabbath Promises. Indeed
“God gave HIM as HEAD over all things
TO THE CHURCH”— by
“the working of his POWER which God worked …
… WHEN HE RAISED CHRIST FROM THE DEAD …”
… “the SUBSTANCE” and “Body of Christ’s Own”.
Colossians 2:12-19.
Therefore “In Creation, God rested the seventh day because He completed the original work of Creation” IN AND THROUGH JESUS CHRIST IN AND THROUGH THE RESURRECTION OF HIM “IN THE SABBATH – SABBATH’S-TIME” the Seventh Day of the week!
Therefore again, absolutely true,
“When mankind sinned, we needed a redeemer.”
And Christ had His work scheduled.”
The Sabbath, like the sacrifice which GOD made THAT DAY
Genesis 3:8-24—ALL— were
types and Divine Promise and Prophecy of CHRIST-AWAITING-HIS-WORK of completion and rest through Resurrection from the dead in the last day.
Jesus Christ is “The Beginning of the creation of God”.
“Christ
sat down to demonstrate that the work was complete” and
“THEREFORE”— Hebrews 4:9 ‘ara’—
_WE_, now as “The People of God are subject to literal Sabbath day observance" = Hebrews 4:9 ‘apoleipetai sabbatismos tohi laohi tou Theou’.
Quoting you, AresMan quoting
Colossians 2
16: Let no man therefore judge you in meat, or in drink, or in respect of an holyday, or of the new moon, or of the sabbath days:
17: Which are a shadow of things to come; but the body is of Christ.
“We enter into His rest:”— we “must keep God’s Sabbath Day”.
But NEVER the other way around because that is what Hebrews 9:8-10 demands!