Sabbath Judaizers
The Council of Laodicea of around 365 AD decreed 59 laws, #29:
"Christians must not judaize by resting on the Sabbath, but must work on that day, rather honoring the Lord's Day; and, if they can, resting then as Christians. But if any shall be found to be judaizers, let them be anathema from Christ."
Pisidian Antioch in the Roman Empire
Acts 13
13 From Paphos,
Paul and his companions sailed to Perga in Pamphylia, where John left them to return to Jerusalem. 14 From Perga they went on to Pisidian Antioch.
On the Sabbath they entered the synagogue and sat down. 15 After the reading from the
Law and the Prophets, the leaders of the synagogue sent word to them, saying, “Brothers, if you have a word of exhortation for the people, please speak.”16 Standing up,
Paul motioned with his hand and said: “Fellow Israelites
and you Gentiles who worship God, listen to me!
44 On
the next Sabbath almost the whole city gathered to hear the word of the Lord. 45 When the Jews saw the crowds, they were filled with jealousy. They began to contradict what
Paul was saying and heaped abuse on him.
46 Then Paul and Barnabas answered them boldly: “We had to speak the word of God to you first. Since you reject it and do not consider yourselves worthy of eternal life,
we now turn to the Gentiles.
48 When the
Gentiles heard this, they were glad and honored the word of the Lord; and all who were appointed for eternal life believed.
The first Gentile converts kept the Sabbath, and so therefore it was not an issue.
The biblical term "proselyte" is an anglicization of the Koine Greek term προσήλυτος/proselytos, as used in the Greek Old Testament for "stranger", i.e. a "newcomer to Israel"; a "sojourner in the land", and in the Greek New Testament for a first century convert to Judaism, generally from Ancient Greek religion. It is a translation of the Biblical Hebrew phrase גר תושב/ ger toshav.
Judaize
YLT
Galatians 2:14
But when I saw that they are not walking uprightly to the truth of the good news, I said to Peter before all, `If thou, being a Jew, in the manner of the nations dost live, and not in the manner of the Jews,
how the nations dost thou compel to Judaize?
Galatians 2:14
But when I saw that they were not walking uprightly according to the truth of the good news, I said to Peter before everyone, If you, being a Jew live in the manner of the nations, and not in the manner of the Jews, then
how will you compel the nations to Judaize?