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On our daf Reish Lakish is quoted as saying that someone who brings a non-kosher animal on the altar in the Temple is liable to receive malkot – lashes. Rabbi Yoḥanan agrees that it is forbidden to do but argues that there is no punishment for doing so. The source of their argument is how to extrapolate from the passage that requires sacrifices to be brought from kosher animals (see Vayikra 1:2).
Rabbi Yoḥanan views this as a mitzvat aseh – a positive commandment – and there is no formal punishment meted out for neglecting to fulfill a positive commandment. According to Reish Lakish this would be considered a lav ha-ba mikhlal aseh – a negative commandment derived from a positive one – which he considers equivalent to a negative commandment.