Reference for Zevachim 190:13

ואי בעית אימא בתנור של חרס זה הסיקו מבפנים וזה הסיקו מבחוץ

[It is indeed] a refutation. Rabina said to R'Ashi: Now since Raba B'Ahilai was refuted, why did Rab say: pots must be broken on Passover?<span class="x" onmousemove="('comment',' For we see that greased ovens (these were generally of earth) can be refired and used, the heat expelling the traces of fat. Then let the pots too be subjected to fire, which would likewise expel the absorbed leaven (it was on account of the absorbed leaven that Rab forbade their use on Passover) .');">¹⁵</span>

Jastrow

Jastrow