The headword phrase in the accusative case (here it is nominative) comes from John 9.1 (Christ sees a man who is tuflo\n e)k geneth=s, and declares that neither the man nor his parents -- the alternatives put to him by the disciples -- are to blame for his condition). It is echoed, presumably accidentally, by Sextus Empiricus, Against the Professors 11.238.
The entry (not in all manuscripts) may come, Adler suggests, from Symeon Metaphrastes.