Reference for Zevachim 159:3

אמר לו רבי אליעזר הרי הוא עובר על בל תגרע אמר ליה רבי יהושע הרי הוא עובר על בל תוסיף

Now, both are necessary. For if it were stated in the former case, I would argue that only there does R. Eliezer rule thus, because his atonement was already made therewith, but in the present instance he agrees with the Rabbis. While if it were stated in the present case, I would argue that only here do the Rabbis rule thus, but in the former instance they agree with R. Eliezer. Hence both are necessary.

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