Acts 17:1 (NKJV) Now when they had passed through Amphipolis and Apollonia, they came to Thessalonica, where there was a synagogue of the Jews. Acts 17:2 Then Paul, as his custom was, went in to them, and for three Sabbaths reasoned with them from the Scriptures, Acts 17:3 explaining and demonstrating that the Messiah had to suffer and rise again from the dead, and [saying], "This Yahushua whom I preach to you is the Messiah." Acts 17:4 And some of them were persuaded; and a great multitude of the devout Greeks, and not a few of the leading women, joined Paul and Silas.
Luke 4:16 (NKJV) So He came to Nazareth, where He had been brought up. And as His custom was, He went into the synagogue on the Sabbath day, and stood up to read.
Acts 13:13 (NKJV) Now when Paul and his party set sail from Paphos, they came to Perga in Pamphylia; and John, departing from them, returned to Jerusalem. Acts 13:14 But when they departed from Perga, they came to Antioch in Pisidia, and went into the synagogue on the Sabbath day and sat down. Acts 13:15 And after the reading of the Law and the Prophets, the rulers of the synagogue sent to them, saying, "Men [and] brethren, if you have any word of exhortation for the people, say on."
Acts 13:42 (NKJV) So when the Jews went out of the synagogue, the Gentiles begged that these words might be preached to them the next Sabbath.
Acts 13:43 Now when the congregation had broken up, many of the Jews and devout proselytes followed Paul and Barnabas, who, speaking to them, persuaded them to continue in the grace of Yahweh Acts 13:44 On the next Sabbath almost the whole city came together to hear the word of Yahweh.
Acts 16:11 (NKJV) Therefore, sailing from Troas, we ran a straight course to Samothrace, and the next [day] came to Neapolis, Acts 16:12 and from there to Philippi, which is the foremost city of that part of Macedonia, a colony. And we were staying in that city for some days. Acts 16:13 And on the Sabbath day we went out of the city to the riverside, where prayer was customarily made; and we sat down and spoke to the women who met [there].
Acts 18:1 (NKJV) After these things Paul departed from Athens and went to Corinth. Acts 18:2 And he found a certain Jew named Aquila, born in Pontus, who had recently come from Italy with his wife Priscilla (because Claudius had commanded all the Jews to depart from Rome); and he came to them. Acts 18:3 So, because he was of the same trade, he stayed with them and worked; for by occupation they were tentmakers. Acts 18:4 And he reasoned in the synagogue every Sabbath, and persuaded both Jews and Greeks.
Sabbath 7 - first day 0
Just on the merit that the 7 day is called Sabbath and not day 7 also the first day is actually never called Sabbath day. I have about 30 other scriptures from NT writings that talk about the Sabbath which is still in effect today. Now before you say I'm working for my salvation by guarding the Sabbath day think again I keep it because of love not because ibis right only.