These shall be your Pythia and your Delia

Explanation

proverb said of those who do something for the very last time. Menander mentions it. They say Polycrates the tyrant of the Samians, having taken Rheneia and dedicated it to Apollo of Delos, instituted a most splendid contest, and sent to Delphi to ask how the contest should be called — Delia or Pythia? The god answered: "These shall be both your Delia and your Pythia." He signified to him that he would die straightway; for Oroetes the Persian crucified him.