Reference for Menachot 13:5

ומקמץ היכי קמץ אלא כגון שהחזירו לביסא טפופה

Then how could he have taken out the handful originally [from this vessel]?<span class="x" onmousemove="('comment',' Since he must take the handful from that which is in the vessel.');">⁸</span> - Rather [say] he put it back into a brimful bowl.

Jastrow