Quoting%20commentary for Avodah Zarah 57:9

ואין מסתפרין מהן בכל מקום: ת"ר ישראל המסתפר מעובד כוכבים רואה במראה ועובד כוכבים המסתפר מישראל כיון שהגיע לבלוריתו שומט את ידו

The Jew must keep his eye on the non-Jew cutting his hair, lest the non-Jew try to murder him. And a Jew may cut a non-Jew’s hair, but not his special forelock for this is associated with idolatry. The Jew should not be seen as helping groom this special part of the hair.

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