Reference for Pesachim 170:11

ואמר רבי שמואל בר רב יצחק מפני מה לא נתקדשה שער נקנור מפני שמצורעין עומדין שם ומכניסין בהונות ידם:

Then consider the sequel: FROM THE DOOR-STOP AND WITHOUT IS AS OUTSIDE [THE CITY]; hence the door-stop itself is as the inside? - There is no difficulty: one refers to the gates of the Temple Court;<span class="x" onmousemove="('comment',' There the space of the door-stop itself is as the inside.');">¹²</span> the other, to the gates o Jerusalem.<span class="x" onmousemove="('comment',' There it is as the outside.');">¹³</span>

Jastrow

Jastrow