Related על פסחים 126:13

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.