Related for Chullin 7:27
ר"א אוסר לפי שאין בקיאין בדקדוקי מצות כישראל
The Master said: 'The unleavened bread of a Cuthean may be eaten, and an Israelite fulfils his obligation by eating of it on the [first night of] Passover'.
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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