The Iliad 15.205

Then answered her again Poseidon, the Shaker of Earth: Goddess Iris, this word of thine is right fitly spoken; and a good thing verily is this, when a messenger hath an understanding heart. But herein dread grief cometh upon my heart and soul, whenso any is minded to upbraid with angry wordsone of like portion with himself, to whom fate hath decreed an equal share. Howbeit for this present will I yield, despite mine indignation; yet another thing will I tell thee, and make this threat in my wrath: if in despite of me, and of Athene, driver of the spoil,and of Hera, and Hermes, and lord Hephaestus, he shall spare steep Ilios, and shall be minded not to lay it waste, neither to give great might to the Argives, let him know this, that between us twain shall be wrath that naught can appease. So saying, the Shaker of Earth left the host of the Achaeans, and fared to the sea and plunged therein; and the Achaean warriors missed him sore.