The Iliad 2.16–22

So he took his stand above his head, in the likeness of the son of Neleus, even Nestor, whom above all the elders Agamemnon held in honour; likening himself to him, the Dream from heaven spake, saying: Thou sleepest, son of wise-hearted Atreus, the tamer of horses. To sleep the whole night through beseemeth not a man that is a counsellor,to whom a host is entrusted, and upon whom rest so many cares. But now, hearken thou quickly unto me, for I am a messenger to thee from Zeus, who, far away though he be, hath exceeding care for thee and pity. He biddeth thee arm the long-haired Achaeans with all speed, since now thou mayest take the broad-wayed city of the Trojans.For the immortals that have homes upon Olympus are no longer divided in counsel, since Hera hath bent the minds of all by her supplication, and over the Trojans hang woes by the will of Zeus. But do thou keep this in thy heart, nor let forgetfulness lay hold of thee, whenso honey-hearted sleep shall let thee go.