Cite a quote that indicates how/when Odysseus revealed his true identity to the suitors

Book 21/ Lines 186-244

Once Odysseus was sure, he opened his mind to them, saying: ‘Well, I am home. Here I stand before you, I myself, back in my own country in the twentieth year after many painful trials. I know that of all my servants you both welcome my return, but I’ve not heard a single one of the others praying I might reach home. I’ll tell you truly what I intend for you. If a god brings the noble Suitors down, I’ll find you each a wife, give you goods, and build you a house near mine: and I’ll always regard you as friends and brothers of Telemachus. Now, so you can be certain in your hearts that it is I, let me show you a sign you’ll know, the scar from the wound the white-tusked boar gave me, when I hunted Parnassus with Autolycus’ sons.’