You need the book to find out what to say. The book is called "Servant of the Serpent" I think. It is located in a secret room in the library. You need to have the snake idol and all 4 monkey idols to open it up.
The snake idol is in the Serpent Holds. The key to the Serpent Holds is with that guy you first talked to in the Temple who tried to recruit you. In case you killed him and can't get the key, I will provide the full out spoiler below.
*spoiler space*
"When the Serpent charms, the servant bows...
When the Serpent schemes, the servant dreams...
When the Serpent sleeps, the servant waits...
When the Serpent strikes, the servant prays."
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