תלמוד על דברים 4:2

As we have stated there⁷⁸MishnahZevaḥim 8:10.: “[Blood] to be given in one batch etc. Rebbi Eliezer said to him, would you not transgress do not diminish? Rebbi Joshua answered him, would you not transgress do not add?⁷⁹Deut. 4:2,13:1.” He said to him, it is better to violate a prohibition that was not caused by me than a prohibition which will come before me.]