Reference for Niddah 6:5
כֹּל שֶׁחַיָּב בַּמַּעַשְׂרוֹת, מִטַּמֵּא טֻמְאַת אֳכָלִים. וְיֵשׁ שֶׁמִּטַּמֵּא טֻמְאַת אֳכָלִין וְאֵינוֹ חַיָּב בַּמַּעַשְׂרוֹת:
Any [food] that requires tithing can be rendered impure with the impurity of foods. But there may be [food] that can be rendered impure with the impurity of foods but which does not require tithing.
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