“But there rose up certain of the sect of the Pharisees which believed, saying, That it was needful to circumcise them, and to command them to keep the law of Moses.”
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).