Reference for Shabbat 205:2

זה הכלל: זה הכלל לאתויי מאי לאתויי דחק קפיזא בקבא:

— The meaning here is that he pierces it with an iron pick and leaves it therein, so that that is the completion of its work. THIS IS THE GENERAL PRINCIPLE. What does THIS IS THE GENERAL PRINCIPLE add?<span class="x" onmousemove="('comment',' It is a rule that this phrase always adds something not explicitly mentioned. ');">³</span>

Jastrow

Jastrow