The Iliad 20.310–317

Shaker of Earth, of thine own self take counsel in thine heart as touching Aeneas, whether thou wilt save him or suffer him to be slain for all his valour by Achilles, Peleus' son. We twain verily, even Pallas Athene and I,have sworn oaths full many among the immortals never to ward off from the Trojans the day of evil, nay, not when all Troy shall burn in the burning of consuming fire, and the warlike sons of the Achaeans shall be the burners thereof. Now when Poseidon, the Shaker of Earth, heard this, he went his way amid the battle and the hurtling of spears, have sworn oaths full many among the immortals never to ward off from the Trojans the day of evil, nay, not when all Troy shall burn in the burning of consuming fire, and the warlike sons of the Achaeans shall be the burners thereof.