New answers tagged passover
4
The whole point of nullifying chamets is to renounce ownership of chamets that you didn't find while you were checking for it (see Pesachim 6b), so it would have to work on unknown chamets. The case of "chometz found on Yom Tov which a person had not been mevatel" is if you didn't nullify it with כל חמירא or otherwise.
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