Reference for Oktzin 3:1

יֵשׁ צְרִיכִין הֶכְשֵׁר וְאֵינָן צְרִיכִים מַחֲשָׁבָה, מַחֲשָׁבָה וְהֶכְשֵׁר, מַחֲשָׁבָה וְלֹא הֶכְשֵׁר, לֹא הֶכְשֵׁר וְלֹא מַחֲשָׁבָה. כָּל הָאֳכָלִים הַמְיֻחָדִים לָאָדָם צְרִיכִין הֶכְשֵׁר וְאֵינָן צְרִיכִים מַחֲשָׁבָה:

There are those [foods] which [before they can be rendered impure] require being primed [for impurity, by becoming damp] but which do not require intentional thought [designating them for human consumption]; and [there are those which require] intentional thought and being primed; and [there are those which require] intentional thought but not being primed; and [finally, there are those which require] neither being primed, nor intentional thought [before they can be rendered impure]. All foods which are designated for human consumption require being primed, but do not require intentional thought.

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