Reference for Menachot 175:10

ומאן דאמר ממטה למעלה מלאים שלא יחסר אבל יותיר מלאים קרינא ביה

is of the opinion that the overflow of the measures was not holy; for the All-Merciful gave unto Moses a hin measure and instructed him to calculate [the smaller measures] by excluding the overflow [of the larger measure].<span class="x" onmousemove="('comment',' For when pouring from a larger vessel which is filled to overflowing into two smaller vessels, by the time the smaller vessels are filled the overflow of the larger will have run off. Hence the several measures were exact measures without the overflow.');">⁸</span>

Jastrow

Jastrow

Jastrow