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(Halitherses): 'I who foretell this am not untried, I know what I am saying. Concerning him, I say that everything was accomplished in the way I said it would be at the time the Argives took ship for Ilion, and with them went resourceful Odysseus. I said that after much suffering, with all his companions lost, in the twentieth year, not recognized by any, he would come home. And now all this is being accomplished.' (2.170-176)
Fair enough: Halitherses points out that his predictions were totally right. At the same time, anyone who knows Odysseus might be able to guess that some back stuff would happen to him. Right?
(Telemachos:) 'For my mother, against her will, is beset by suitors, own sons to the men who are greatest hereabouts. These shrink from making the journey to the house of her father Ikarios, so that he might take bride gifts for his daughter and bestow her on the one he wished, who came as his favorite; rather, all their days, they come and loiter in our house and sacrifice our oxen and our sheep and our fat goats and make a holiday feast of it and drink the bright wine recklessly. Most of our substance is wasted.' (2.50-58)
The problem isn't just that the suitors aren't eating up all of Odysseus's goats; it's also that they haven't done the right thing by approaching Penelope's dad. They're totally ignoring the proper family structure—just one more reason they're in for a bloody demise.
When they had made fast the running gear all along the black ship, then they set up the mixing bowls, filling them brimful with wine, and poured to the gods immortal and everlasting but beyond all other gods they poured to Zeus’ gray-eyed daughter. (2.430-433)
Pouring out perfectly good wine (and burning perfectly good ram's thighs) definitely sounds like a "sacrifice": it's a good way to convince the gods that you take them seriously.