Us Catholics, as you know, go to Mass on the 7th day as it is the day Christ rose from the dead
Matthew 28:1 And in the end of the sabbath, when it began to dawn towards the first day of the week [Sunday], came Mary Magdalen and the other Mary, to see the sepulchre.
From the beginings of Christianity this was so
Acts 20:7 And on the first day of the week, when we were assembled to break bread, Paul discoursed with them, being to depart on the morrow. And he continued his speech until midnight.
1 Corinthians 16:1,2 Now concerning the collection for the saints, as I have given order to the churches of Galatia, even so do ye. Upon the first day of the week let every one of you lay by him in store, as God hath prospered him, that there be no gatherings when I come.
whoever breaks one of the least of these commandments and teaches others to do so will be called least in the Kingdom of heaven
Jesus was rebuked by the Pharisees becuase his disciples were walking through the grain fields and eating the heads of grain which was not permissable on the Sabbath to do. Jesus didn’t seem too concerned. He notes an example of David and those who were with him eating the shewbread that only the priests of the temple were allowed to eat.
Mark 2:24-28 And the Pharisees said unto him, Behold, why do they on the sabbath day that which is not lawful? And he said unto them, Have ye never read what David did, when he had need, and was an hungred, he, and they that were with him? How he went into the house of God in the days of Abiathar the high priest, and did eat the shewbread, which is not lawful to eat but for the priests, and gave also to them which were with him? And he said unto them, The sabbath was made for man, and not man for the sabbath: Therefore the Son of man is Lord also of the sabbath.
There’s also the healing Christ did on the Sabbath too.
**Christ said that he is Lord of the Sabbath **and if He decided, or gave his Church the authority to decide, that Mass should be on Sunday, who are we to say otherwise.
It’s interesting that this person brings up the law, as against good works in the justification process protestants always note that we are not justified by works of the law.
**Letter of Barnabas 15:6-8, written in A.D. 74, **
at the end of a few paragraphs on the old Jewish Shabat vs. the Christian Lord’s Day, wrote:
“We keep the eighth day [Sunday] with joyfulness, the day also on which Jesus rose again from the dead.”
2 Corinthians 3:7-11: But if the ministration of death, written and engraven in stones, was glorious, so that the children of Israel could not stedfastly behold the face of Moses for the glory of his countenance; which glory was to be done away: How shall not the ministration of the spirit be rather glorious? For if the ministration of condemnation be glory, much more doth the ministration of righteousness exceed in glory. For even that which was made glorious had no glory in this respect, by reason of the glory that excelleth. For if that which is done away was glorious, much more that which remaineth is glorious.
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
Galatians 3:13-14 Christ hath redeemed us from the curse of the law, being made a curse for us: for it is written, Cursed is every one that hangeth on a tree: That the blessing of Abraham might come on the Gentiles through Jesus Christ; that we might receive the promise of the Spirit through faith.
Even the Jews’ Talmud acknowledges that Christians worship on Sunday. From Abhodah Zarah, 6a, we read: “He is called a Christian who follows the false teachings of that man [Jesus Christ], who taught them to celebrate the feast on the first day of the Sabbath, that is, to worship on the first day after the Sabbath.” So any Messianics and Judaized Christians out there who appeal to the Gospel on one hand, and to rabbinical “authority” on the other, take heed.
some of the quotes come from this link
fisheaters.com/sunday.html