The Iliad by Homer — Book XIX, Achilles arms; Xanthus prophesies

He also drew his father's spear out of the spear-stand, a spear so great and heavy and strong that none of the Achaeans save only Achilles had strength to wield it; this was the spear of Pelian ash from the topmost ridges of Mount Pelion, which Chiron had once given to Peleus, fraught with the death of heroes. Automedon and Alkimos busied themselves with the harnessing of his horses; they made the bands fast about them, and put the bit in their mouths, drawing the reins back towards the chariot. Automedon, whip in hand, sprang up behind the horses, and after him Achilles mounted in full armor, resplendent as the sun-god Hyperion. Then with a loud voice he chided with his father's horses saying, "Xanthos and Balios, famed offspring of Podarge - this time when we have done fighting be sure and bring your driver safely back to the host of the Achaeans, and do not leave him dead on the plain as you did Patroklos."

⁴⁰⁴Then fleet Xanthos answered under the yoke - for white-armed Hera had endowed him with human speech - and he bowed his head till his mane touched the ground as it hung down from under the yoke-band. "Dread Achilles," said he, "we will indeed save you now, but the day of your death is near, and we will not be responsible [aitioi], for it will be heaven and stern fate that will destroy you. Neither was it through any sloth or slackness on our part that the Trojans stripped Patroklos of his armor; it was the mighty god whom lovely Leto bore that slew him as he fought among the foremost, and granted a triumph to Hektor. We two can fly as swiftly as Zephyros who they say is fleetest of all winds; nevertheless it is your doom to fall by the hand of a man and of a god."

⁴¹⁸When he had thus spoken, the Erinyes stayed his speech, and Achilles answered him in great sadness, saying, "Why, O Xanthos, do you thus foretell my death? You need not do so, for I well know that I am to fall here, far from my dear father and mother; none the more, however, shall I stay my hand till I have given the Trojans their fill of fighting."

⁴²⁴So saying, with a loud cry he drove his horses to the front.