Reference for Temurah 17:17

ואידך טוב מעיקרו עושה תמורה רע מעיקרו אין עושה תמורה

- Said Abaye: Let Scripture say, 'He shall not alter it nor change it, a good for a bad or a bad for it'.<span class="x" onmousemove="('comment',' And we could infer: Or a bad hullin could not be exchanged either for 'a good' or for 'a bad' consecrated animal.');">¹¹</span>

Jastrow