Related for Chullin 7:24
אלא כיון דאחזיקו בהו אחזיקו בהו ה"נ כיון דאחזיקו אחזיקו
It may not be eaten, because they are not versed in the details of the precepts like an Israelite.
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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