The Odyssey by Homer Book 24 Page 21

Ulysses was touched, and his nostrils quivered as he looked upon his father; then he sprang towards him, flung his arms about him and kissed him, saying, “I am he, father, about whom you are asking — I have returned after having been away for twenty years. But cease your sighing and lamentation — we have no time to lose, for I should tell you that I have been killing the suitors in my house, to punish them for their insolence and crimes.”

“If you really are my son Ulysses,” replied Laertes, “and have come back again, you must give me such manifest proof of your identity as shall convince me.”

“First observe this scar,” answered Ulysses, “which I got from a boar’s tusk when I was hunting on Mt. Parnassus.