Reference for Zevachim 111:4

ואלא למעוטי לשכות ואי בנויות בחול ופתוחות לקדש והתנן תוכן קודש מדרבנן

- Rather, it is to exclude the chambers.<span class="x" onmousemove="('comment',' Flanking the Temple court.');">²</span> But if they are built on nonsacred ground and open into sacred ground, surely we learnt: Their inside is holy? - That is by Rabbinical law [only] - And not by Scriptural law?

Jastrow