Reference for Zevachim 238:20

מחיצה בדמים דכתיב (שמות כז, ה) והיתה הרשת עד חצי המזבח: ריחוץ ידים דכתיב (שמות מ, לב) ובקרבתם אל המזבח ירחצו

If he consecrated them when bamoth were permitted and slaughtered and offered [them] up when bamoth were forbidden, without, they are subject to an affirmative and a negative injunction, and do not entail kareth.<span class="x" onmousemove="('comment',' This explicitly contradicts R. Kahana.');">¹⁴</span>

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