Show me a text by those who knew Jesus best, that the Sabbath was abolished or changed to the day of the Sun? Sunday worship is worshipping the Sun. Like Easter, it has nothing to do with Christ or Yehovah. I am the same yesterday, today and tomorrow.
I know nobody will be changed by my words. Believe the words you like best, it is what people do.
Sounds like you doubt that Christ was resurrected on Sunday (8th day).
It’s in the Bible, throughout the Gospel accounts.
“I have not come to abolish the Law, but fulfill it”
The Sabbath commandment was fulfilled in Christ and His resurrection was the beginning of His New Testament.