Unspeakable Words in Greek Tragedy

There is a scene in Sophocles’ Oedipus which, for all its power, has lost the power it once possessed to move its Athenian audience. The only vestige of this power is a confusion in our commentaries on the line Oedipus finally extorts from a prophet who would prefer to remain silent:

ϕονέα σε ϕημι τάνδρός ού ζητείς κυρεΐν (362).