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Can one spread kosher cream cheese with a treif knife? I'm looking for sources (obviously will AYCLOP for final psak) Thank you,

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If the knife is cold and clean, and the cream cheese doesn't contain onions/hot peppers, then this is permitted.

R Yitzchok Yaakov Fuchs (in his book Hakashrut, p. 668) writes

A completely clean knife that is found in a non-kosher kitchen may be used to cut cold fruit and vegetables however it may not be used to cut sharp foods.

R Binyamin Tabady and R Yonathan Jessurun both told me they permitted this on a one-off basis, i.e., not something to be done regularly.

Of course, consult your rabbi before implementing anything you learn here.

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    I heard in the name of Rav Herschel Schachter that this knife can be used once every thirty days – robev Jan 28 at 18:35

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