Reference for Pesachim 127:13

שחט ישראל וקבל הכהן נותנו לחבירו וחבירו לחבירו ומקבל את המלא ומחזיר את הריקן כהן הקרוב אצל המזבח זורקו זריקה אחת כנגד היסוד

THEY RECITED THE HALLEL;<span class="x" onmousemove="('comment',' Lit., 'praise', a liturgical passage at present consisting of Ps. CXIII-CXVIII. This was recited by each group.');">²⁴</span> IF THEY FINISHED IT<span class="x" onmousemove="('comment',' Before they finished sacrificing.');">²⁵</span> THEY REPEATED, AND IF THEY REPEATED [AND WERE NOT FINISHED YET], THEY RECITED IT A THIRD TIME, THOUGH THEY NEVER DID RECITE IT A THIRD TIME.

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