Butter, bread, and green cheese: whoever cannot say that is not a true Frisian.

Bûter, brea en griene tsiis: wa't dat net sizze ken, is gjin oprjochte Frys.

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Notes from Wikiquote

According to legend, Pier forced his captives to repeat this shibboleth to distinguish Frisians from Dutch and Low Germans.

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Attribution

Quote text and notes from Wikiquote: Pier Gerlofs Donia (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.