Related for Pesachim 126:13
תניא כוותיה דרב פפא השוחט את הפסח על החמץ עובר בל"ת אימתי בזמן שהוא לשוחט או לזורק או לאחד מבני חבורה היה לאחד בסוף העולם אין זקוק לו ואחד השוחט ואחד הזורק ואחד המקטיר חייב אבל המולק את העוף בארבעה עשר אינו עובר בלא כלום
But the following contradicts it: He who slaughters the Passover offering with leaven violates a negative command. R'Judah said: The tamid too.<span class="x" onmousemove="('comment',' V. note on MISHNAH: vzn ezr');"><sup>20</sup></span> Said they to him, They [the Sages] said [thus] of nought except the Passover-offering alone.
Tosefta Pesachim
One who slaughters the Passover offering along with chametz on the fourteenth [of Nissan] transgresses a negative commandment, [but the] Passover offering itself is valid, and he fulfills his obligation through it with [respect to] the Passover offering. And whether he is the one who slaughters it, or the one who sprinkles its blood, or the one who offers it up [on the Altar, he is liable]. In what case does this apply? When one of the members of a collective [who will partake in the Paschal lamb] has chametz [in his possession]. If none of the members of the collective has chametz, he is exempt, but the one who pinches the neck of a bird inside [the Temple] with chametz on the fourteenth transgresses a negative commandment.
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