The Iliad 1.518–527

and declares that I give aid to the Trojans in battle. But for the present, depart again, lest Hera note something; and I will take thought for these things to bring all to pass. Come, I will bow my head to you, that thou may be certain, for this from me is the surest token among the immortals; no word of mine may be recalled, nor is false, nor unfulfilled, to which I bow my head.