Χοηφόροι

From LSJ

Χαίρειν ἐπ' αἰσχροῖς οὐδέποτε χρὴ πράγμασιν → Non decet in rebus esse laetum turpibus → In schlimmer Not ist Freude niemals angebracht

Menander, Monostichoi, 544

Wikipedia EN

In The Libation Bearers, Libation-Bearers (Χοηφóρoι, Choēphóroi, Choephoroe, Choephori)—the second play of Aeschylus' Oresteia trilogy—many years after the murder of Agamemnon, his son Orestes returns to Argos with his cousin Pylades to exact vengeance on Clytemnestra, as an order from Apollo, for killing Agamemnon.