Responsa for Chullin 266:29
בני מעיין שלי וכולה שלך אפי' אחד ממאה בהן פטור
and whosoever neglects them is as though he neglects [the whole Torah which is expounded by] generalizations and specifications and [the sacrifices which were confirmed by] a covenant of salt.
Shut min haShamayim
Regarding the third matter, they responded: "It is not common to trust a non-Jew." (Chullin 133b:4), and we should not rely on their testimony, and it has been said (Bava Batra 91b:6): "One who relies on them falls into their hands."
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