Related for Chullin 7:3
אביי דייק מרישא
Abaye emphasizes the first part of the statement, [viz.] the reason [why the slaughtering of a Cuthean is valid is] that 'an Israelite was standing over him at the time', which implies that if the Israelite was merely going in and out it is not sufficient.
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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