εἶτα σὺ φθέγγει καὶ βλέπειν εἰς τουτωνὶ πρόσωπα τολμᾷς
From LSJ
βορβόρῳ δ' ὕδωρ λαμπρὸν μιαίνων οὔποθ' εὑρήσεις ποτόν → once limpid waters are stained with mud, you'll never find a drink
English > Greek (Woodhouse Quotes Reversed)
do you then lift up your voice and dare to look these men in the face