Reference for Yoma 86:3

(במדבר יט, יט) והזה הטהור על הטמא טהור מכלל שהוא טמא לימד על טבול יום שכשר בפרה

that informs us that a tebul-yom is qualified [to officiate] at the heifer [ceremony]. R'Assi said: When R'Johanan and Resh Lakish engaged in investigating questions about the heifer, they were unable to produce more than what a fox can bring up from a ploughed field, but they said this chapter contains [texts] implying an exception from a preceding implication, and [texts] independent of preceding or following implications.<span class="x" onmousemove="('comment',' Hence it is impossible to explain them on one schema, because of the particular condition of this chapter, but for the tradition, the inferences would appear incompatible.');">⁴</span>

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