Reference for Eruvin 124:9

א"ל אביי לרב יוסף קי"ל משנת רבי אליעזר בן יעקב קב ונקי ואמר רב יהודה אמר שמואל הלכה כרבי אליעזר בן יעקב

is it then permitted<span class="x" onmousemove="('comment',' Since the ruling is so unquestionably authoritative.');">²³</span> to a disciple<span class="x" onmousemove="('comment',' Who in ordinary cases must not venture to give a decision in a locality that is under his Master's jurisdiction.');">²⁴</span> to give a ruling accordingly<span class="x" onmousemove="('comment',' In agreement with R. Eliezer b. Jacob (v. our Mishnah) . ukhpt');">²⁵</span> in a district that i under the jurisdiction of his Master? - 'Even',the other replied, on the question of the permissibility of eating an egg<span class="x" onmousemove="('comment',' A perfectly developed egg found in a slaughtered fowl (so Tosaf. s.v. a.l.) . The question whether a properly laid egg may be eaten with milk (cf. following n.) could, of course, never arise (v. however, Rashi) .');">²⁶</span>

Jastrow