Reference for Zevachim 212:4

(ויקרא יז, ה) והביאום לה' זו מצות עשה לא תעשה מניין ת"ל (ויקרא יז, ז) ולא יזבחו עוד

Even that they may bring them unto the Lord':<span class="x" onmousemove="('comment',' Ibid., 5.');">²</span> this is a positive injunction.<span class="x" onmousemove="('comment',' Though the inference is obviously that they may not bring them to the bamoth but only 'unto the Lord' (i.e. at the Tabernacle) , yet since it is expressed affirmatively, the implied interdict counts as a positive injunction.');">³</span>

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