Paul's on-the-record statement to Messianic Jews --
Acts 21:20 And when they heard it they
began glorifying God; and they said to him, “You see, brother, how many thousands there are among the Jews of those who have believed, and they are all zealous for the Law; 21 and they have been told about you, that
you are teaching all the Jews who are among the Gentiles to forsake Moses, telling them not to circumcise their children nor to walk according to the customs.
(Many here would argue - "yeah... that is EXACTLY what Paul was doing!" - Paul goes out of his way to disprove it.)
22 What, then, is to be done? They will certainly hear that you have come. 23 Therefore do this that we tell you. We have four men who are under a vow; 24 take them and purify yourself along with them, and pay their expenses so that they may shave their heads; and all will know that there is nothing to the things which they have been told about you, but that you yourself also walk orderly, keeping the Law.