Berean Study Bible
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.

King James Bible
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:

American Standard Version
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:

Darby Bible Translation
and [it was] on account of the false brethren brought in surreptitiously, who came in surreptitiously to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage;

Douay-Rheims Bible
But because of false brethren unawares brought in, who came in privately to spy our liberty, which we have in Christ Jesus, that they might bring us into servitude.

English Revised Version
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:

Young's Literal Translation
and that because of the false brethren brought in unawares, who did come in privily to spy out our liberty that we have in Christ Jesus, that us they might bring under bondage,