The Iliad 1.68–73

and who had guided the ships of the Achaeans to Ilios by his own prophetic powers which Phoebus Apollo had bestowed upon him. He with good intent addressed the gathering, and spoke among them: Achilles, dear to Zeus, you bid me declare the wrath of Apollo, the lord who strikes from afar.Therefore I will speak; but take thought and swear that you will readily defend me with word and with might of hand; for I think I shall anger a man who rules mightily over all the Argives, and whom the Achaeans obey. For mightier is a king, when he is angry at a lesser man.Even if he swallows down his wrath for that day, yet afterwards he cherishes resentment in his heart till he brings it to fulfillment. Say then, if you will keep me safe. In answer to him spoke swift-footed Achilles: Take heart, and speak out whatever oracle you know;for by Apollo, dear to Zeus, to whom you, Calchas, pray when you reveal oracles to the Danaans, no one, while I live and have sight on the earth, shall lay heavy hands on you beside the hollow ships, no one of the whole host of the Danaans,not even if you name Agamemnon, who now claims to be far the best of the Achaeans.