This issue arose because some false brothers had come in under false pretenses to spy on our freedom in Christ Jesus, in order to enslave us.
KJV
And that because of false brethren unawares brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage:
ASV
and that because of the false brethren privily brought in, who came in privily to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage: