The Iliad 3.274–275

Then in their midst Agamemnon lifted up his hands and prayed aloud: Father Zeus, that rulest from Ida, most glorious, most great, and thou Sun, that beholdest all things and hearest all things, and ye rivers and thou earth, and ye that in the world below take vengeance on men that are done with life, whosoever hath sworn a false oath;be ye witnesses, and watch over the oaths of faith. If Alexander slay Menelaus, then let him keep Helen and all her treasure; and we will depart in our seafaring ships. But if so be fair-haired Menelaus shall slay Alexander,then let the Trojans give back Helen and all her treasure, and pay to the Argives in requital such recompense as beseemeth, even such as shall abide in the minds of men that are yet to be. Howbeit, if Priam and the sons of Priam be not minded to pay recompense unto me, when Alexander falleth,then will I fight on even thereafter, to get me recompense, and will abide here until I find an end of war. He spake, and cut the lambs' throats with the pitiless bronze; and laid them down upon the ground gasping and failing of breath, for the bronze had robbed them of their strength.