The Iliad by Homer Book 19 Page 16

and Talthybius whose voice was like that of a god came to him with the boar. The son of Atreus drew the knife which he wore by the scabbard of his mighty sword, and began by cutting off some bristles from the boar, lifting up his hands in prayer as he did so. The other Achaeans sat where they were all silent and orderly to hear the king, and Agamemnon looked into the vault of heaven and prayed saying, “I call Jove the first and mightiest of all gods to witness, I call also Earth and Sun and the Erinyes who dwell below and take vengeance on him who shall swear falsely, that I have laid no hand upon the girl Briseis, neither to take her to my bed nor otherwise, but that she has remained in my tents inviolate. If I swear falsely may heaven visit me with all the penalties which it metes out to those who perjure themselves.”