ἐξάγγελος
From LSJ
Λόγος εὐχάριστος χάριτός ἐστ' ἀνταπόδοσις → Es sermo gratus pro relata gratia → Ein gutes Wort ist Dank für eine gute Tat
English (LSJ)
ὁ, ἡ,
A messenger who brings out news from within: hence, one who betrays a secret, informer, ἐ. γίγνεται ὡς . . Th.8.51; ἐ. γίγνεσθαί τινος Pl.Lg.964e, etc. II on the Greek stage, messenger who told what was doing in the house or behind the scenes (opp. ἄγγελος, who told news from a distance); first used by Aeschylus, Philostr.VS1.9.