Related for Chullin 7:48
תנא קמא סבר
of transgressors<span class="x" onmousemove="('comment',' Those who do not destroy all leavened bread before the passover, according to prescribed law (Exod. XII, 15) , because of the loss it entails.');"><sup>22</sup></span>
Tosefta Pesachim
The matzah of the Samaritans is permitted, and a person fulfills his obligation on Passover [with it]. But Rabbi Eliezer forbids it because [according to him,] they are not learned in the details of the mitzvah. Rabban Shimon ben Gamaliel says, every mitzvah that the Samaritans accepted upon themselves -- they are more scrupulous in it[s observance] than a Jew.
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