Reference for Pesachim 157:15

אמר רב חסדא לא שנו אלא שנטמא הסכין בטמא מת דרחמנא אמר (במדבר יט, טז) בחלל חרב חרב הרי הוא כחלל

IF A MINORITY OF THE COMMUNITY WERE DEFILED: THOSE WHO ARE CLEAN OBSERVE THE FIRST [PASSOVER], WHILE THOSE WHO ARE UNCLEAN OBSERVE THE SECOND. <big><b>GEMARA: </b></big>Our Rabbis taught: Behold, if the Israelites were unclean, while the priests and the service-vessels<span class="x" onmousemove="('comment',' Used in connection with the sacrifice, the slaughtering knife and basins in which the blood is caught.');">¹⁷</span>

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