Reference for Yoma 146:19

והוינן בה אמאי חייב מושבע ועומד מהר סיני הוא רב ושמואל ורבי יוחנן דאמרי בכולל דברים המותרים עם דברים האסורין

That will be right according to the view that even less than legal quantity is for - bidden by the law of the Torah, but what can be said according to the view that less than the legal quantity is permitted by the law of the Torah? For it was said: As for less than the legal quantity, R'Johanan holds it forbidden by the law of the Torah, but Resh Lakish considers it permitted by the law of the Torah.

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