{Mine} (em(885c)). Possessive pronoun, "not mine in origin."
Jesus denies that he is self-taught, though not a schoolman. {But
his that sent me} (alla tou pempsantos me). Genitive case of
the articular participle (first aorist active of pemp(935c)). His
teaching is not self-originated nor is it the product of the
schools (see the Talmud in contrast with the New Testament).
Jesus often in John uses this idiom of "the one who sent me" of
the Father ( 4:34  5:23,24,30,37  6:38-40,44  7:16,18,28 , etc.).
The bold claim is here made by Jesus that his teaching is
superior in character and source to that of the rabbis.