Galatians 2:4
And that because of false brothers unawares brought in, who came in privately to spy out our liberty which we have in Christ Jesus, that they might bring us into bondage:
Nave's Topical Index

The Synod of Jerusalem, and the Compromise Between Jewish and ...
... in Corinth as well as in Galatia, were not ... into the Christian brotherhood as spies
and enemies ... against this laxity in the Corinthian congregation, and condemns ...
/.../schaff/history of the christian church volume i/section 34 the synod of.htm

What is the significance of a scarlet thread? | GotQuestions.org

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Spies: Dictionary and Thesaurus | Clyx.com

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