Related for Chullin 7:31
מצת כותי מותרת ואדם יוצא בה ידי חובתו בפסח
It may not be eaten, because they are not versed in the details o the precepts like an Israelite'; for he is of the opinion that they are not versed in [the regulation of] supervision.<span class="x" onmousemove="('comment',' I.e., to guard the dough against becoming leavened. Var. lec., they are not well versed in (what constitutes) leaven. V. Rashi.');"><sup>14</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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