Reference for Zevachim 40:3

לעולם כרבי אלעזר ברבי שמעון והכא במאי עסקינן בכהני חדתי:

If with Rabbi, then the passing of the night nullifies it; if with R'Eleazar son of R'Simeon, surely he said that he does not need sanctification even for ten days? - In truth, it agrees with R'Eleazar son of R'Simeon, the reference being to fresh priests.<span class="x" onmousemove="('comment',' Who had not been ministering earlier in the night.');">¹</span>

Jastrow