Reference for Niddah 102:4

כל מילי דעביד לטעמא מטמא טומאת אוכלין דהאי שבת לטעמא עבידא

and the principal spices, crowfoot, asafoetida, pepper and lozenges of bastard safron may be bought with second tithe money but they are not susceptible to food uncleanness; so R. Akiba. Said R. Johanan b. Nuri to him: If they may be bought with second tithe money why are they not susceptible to food uncleanness? And if they are not susceptible,<span class="x" onmousemove="('comment',' To food uncleanness, which is evidence that they are not regarded as a foodstuff. ');">⁴</span>

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