I put this out for consideration.
Having been a Sabbath KEEPER for decades (but no longer), I suggest the understanding may be similar for those in Christ (who he was talking to) who may still OBSERVE (1) a Sabbath and cherish the opportunity for time with God and family - brother and sisters in Christ.
To be deprived of this generational observance, because they were 'fleeing', would be an extra burden to bear.
There is no 'command' to keep a Sabbath under the New Covenant, but that does not diminish the opportunity to partake of the benefits long held dear.
- by observe I mean to set the day aside for generally Godly purposes and pursuits, but not to adhere to the sunset to sunset, or many other limitations imposed on the 'holy time that was required under the law.
Regarding any requirement to 'keep' a Sabbath today, we can look to Jesus as a guide.
- He did things on the Sabbath that were contrary to traditional understanding and practises
- We are never told he rested on the
- the Sabbath was one of many signs that separated Israel from the Gentile nations - this separation is now removed in Christ.
- He spoke about the Sabbath wasn't intended to be a burden - the Sabbath was made for man, not the reverse Mark 2:27.
- Like practically everything in the OT, they were a type of something far grander - Jesus came to point to this progression and initiate some of the changes. The Holy Days are different now, and some seem to be still observed into the future.
- Paul warns to not judge on things including the Sabbath and other OT practises.
- There are no gains in righteousness by keeping a Sabbath - our entire standing is in Jesus by grace - certainly not by keeping a day!