The disciples taught the gentiles to be circumcised and keep the law.
Acts 16: 3 Paul wanted to take this man with him and he took and circumcised him, because all the Jews in that place knew that his father was an Aramaean.

4 As they were going among the cities preaching, they were also teaching them to keep those commandments that the Apostles and Elders who were in Jerusalem had written;

Acts 21: 20 And when they had heard, they praised God and said to him: "You see our brother, how many tens of thousands are in Judea who have believed, and they are all zealous of The Law."

21 But it has been told them that you teach all the Jews who are among the Gentiles to separate from Moses while you say that they should not circumcise their sons and that they should not walk by the custom of The Law.