“But there rose vp certaine of the sect of the Pharisees which beleeued, saying, that it was needfull to circumcise them, and to cōmand them to keepe the Law of Moses.”
1611 King James Version (KJV)
15:5 But certain Pharisees - For even believers are apt to retain their former turn of mind, and prejudices derived therefrom. The law of Moses - The whole law, both moral and ritual.
Ac 15:5 There rose up certain of the sect of the Pharisees. Men of that sect who, like Paul, had become Christians, but unlike him had retained their Jewish bigotry. Perhaps some of them were Paul's old friends. They seem to have sprung the controversy when the missionaries gave account of their work (Ac 15:4).