Romans 6:15 "What then? Shall we sin because we are not under the law but under grace? By no means!"
1 Corinthians 10:23
"23 All things are permitted, but not all things are of benefit. All things are permitted, but not all things build people up."
Romans 3:20
'Therefore no one will be declared righteous in God’s sight by the works of the law; rather, through the law we become conscious of our sin."
Matt. 5:17-18
"Do not think that I came to destroy the Law or the Prophets. I did not come to destroy but to fulfill. For assuredly, I say to you, till heaven and earth pass away, one jot or one tittle will by no means pass from the law till all is fulfilled"
John 19:30 "It is finished" On the cross, this was fulfilled.
Acts 18:4–6
"4 And he reasoned in the synagogue every Sabbath, and tried to persuade Jews and Greeks.
5 when Silas and Timothy arrived from Macedonia, Paul was occupied with the word, testifying to the Jews that the Christ was Jesus. 6 And when they opposed and reviled him, he shook out his garments and said to them, e“Your blood be on your own heads! I am innocent. from now on I will go to the Gentiles.”
The Jews were under the Law the Gentiles were not. The Law was given as a covenant between God and the Jews. This is why Paul followed the Sabbath and preached on it to the Jews but when he went to the Gentiles he no longer practiced the Sabbath. In fact, the early church met on the first day of the week as their practice.
Acts 20:7 " 7 On the first day of the week we came together to break bread. Since Paul was ready to leave the next day, he talked to them and kept on speaking until midnight. "
Romans 14:4-6 "…4 Who are you to judge someone else’s servant? To his own master, he stands or falls. And he will stand, for the Lord is able to make him stand. 5 One person regards a certain day above the others, while someone else considers every day alike. Each one should be fully convinced in his own mind. 6 He who observes a special day does so to the Lord; he who eats does so to the Lord, for he gives thanks to God; and he who abstains does so to the Lord and gives thanks to God.…"
It is legalism to preach that everyone should worship on a particular day. God gave us a choice of which day we worship and some worship every day. The Lord's supper was observed every time the brethren came together.
1 Corinthians 14:26 "26 What then shall we say, brothers? When you come together, everyone has a psalm or a teaching, a revelation, a tongue, or an interpretation. All of these must be done to build up the church."
All the brethren participate in the gathering, asking for a song, and bringing scripture while others preach. There are no pew-people and no pulpit people in the gathering when it is done the way God intended. No one has authority over others except the Holy Spirit in every believer.
What a beautiful thing when all the men participate as led by the Holy Spirit. I have seen this practiced, the gathering is all about Christ, no one is prominent above others, and Christ is pre-eminent always.