Reference for Pesachim 127:11
<big><strong>מתני׳</strong></big> הפסח נשחט בשלש כתות שנאמר (שמות יב, ו) ושחטו אותו כל קהל עדת ישראל קהל ועדה וישראל נכנסה כת הראשונה נתמלאה העזרה נעלו דלתות העזרה תקעו הריעו ותקעו
THE PRIESTS STOOD IN ROWS, AND IN THEIR HANDS WERE BASINS<span class="x" onmousemove="('comment',' To receive the blood.');"><sup>21</sup></span> OF SILVER AND BASINS OF GOLD; A ROW WHICH WAS ENTIRELY OF SILVER WAS OF SILVER, AND A ROW WHICH WAS ENTIRELY OF GOLD WAS OF GOLD: THEY WERE NOT MIXED; AND THE BASINS HAD NO [FLAT] BOTTOMS, LEST THEY PUT THEM DOWN AND THE BLOOD BECOME CONGEALED. THE ISRAELITE KILLED [THE LAMB], AND THE PRIEST CAUGHT [THE BLOOD]; HE HANDED IT TO HIS COLLEAGUE AND HIS COLLEAGUE [PASSED IT ON] TO HIS COLLEAGUE; AND HE RECEIVED THE FULL [BASIN] AND GAVE BACK THE EMPTY ONE.<span class="x" onmousemove="('comment',' After the blood had been sprinkled. Thus it was worked on the 'endless-chain' system.');"><sup>22</sup></span>