God Himself foretold in the Old Testament when the Sabbath would end, and it ended exactly when He said it would - at the cross. Up until that time Jesus kept the Sabbath because he was fulfilling the Law. The Sabbath ended at the cross. If you knew your Old Testament better you would know where it was prophesied and if you knew your New Testament better you would know how and WHEN it was fulfilled.
In fact He said in Matthew 24:20 about an event many years after His resurrection that the Sabbath was still valid.
You ought to be more careful about what you say the Lord said. He did NOT say "that the Sabbath was still valid". In Luke 21 He gave Christians in the city of Jerusalem instructions to FLEE THE CITY before the Roman armies surrounding the city destroyed it. The reason he instructed them to pray that their flight not be on a Sabbath day is that the Jews who controlled the city up until 70 AD always CLOSED THE GATES OF THE CITY ON THE SABBATH (Nehemiah 13:15-22) in which case the Christians could not get out.
In Matthew 24 that you cite Jesus lists 3 things that would hinder fleeing the city:
*Pregnant or Nursing mothers would be hindered for obvious reasons
*Winter would hinder because of exposure to cold temperatures and possibly snow.
*And closed, locked city gates on the Sabbath day would also obviously hinder their escape.
If you want to read some sort of doctrinal significance into these hindrances to fleeing the city, fine, but a requirement to keep the Sabbath is not even a remotely plausible one.
Cordially,
>> “God Himself foretold in the Old Testament when the Sabbath would end” <<
.
That is simply a falsehood in perfect inversion of the word.