Words referred to Sankaracharya

Namaste,
I have been trying to find certain words referred to Sankaracharya,
and could not, thus far. help will be Appreciated.
The words are:“I am the Absolute through the words of my Guru"
Possibly spelled “Desikotya shivoham”
Reference to the source will be appreciated
:pray:

It is in Advaita pañcaratnam
https://wiki.shayvam.com/index.php?title=Адвайта-панчаратна