Homer, Iliad 9.312-313

ἐχθρὸς γάρ μοι κεῖνος ὁμῶς Ἀΐδαο πύλῃσιν
ὅς χ᾽ ἕτερον μὲν κεύθῃ ἐνὶ φρεσίν, ἄλλο δὲ εἴπῃ.

Hateful to me as the gates of Hades is that man who says one thing but conceals another thing in his heart.