Which lines from book 31 of homers Odyssey depict the theme of disguise

In
the book there is a part where Odysseus makes it back to his homeland
where he meets with the goddess Athene. She herself was disguised as
a young shepherd to approach him and then reveals to him her true
identity. She then disguises Odysseus to take back his home.
Athena
tells Odysseus she will disguise him as a beggar, because she is the
master of disguises and no one likes to look too closely at beggars
anyway.
“Athena
transforms him into an old man as a disguise. Clad in a filthy tunic,
he goes off to find his faithful swineherd, as instructed by the
goddess.”
though i think you mistakenly said book 31 if im correct? so I did book 13.