Question about the Netflix series Warrior Now: What does the title of the 4th episode Ecclesiastes 26: 9-10 refer to?

The episode titles in the "Warrior Nun" series on Netflix are all Bible passages. Episode 4 is called "Ecclesiastes 26: 9-10":

https://de.wikipedia.org/...arrior_Nun

Unfortunately the book "Preacher" or "Preacher Solomon" only has 11 chapters.

Can someone who is familiar with biblical passages figure it out or tell me which passage is / could be meant?

The original title seems to be "Ecclesiasticus" according to Wikipedia. That probably refers to the book "Jesus Sirach": https://www.bibleserver.com/LUT/Jesus%20Sirach26

This book does not belong to the actual canon of the 66 biblical books, but to the so-called Apocrypha: https://www.gotquestions.org/Deutsch/Apokryphen-Deuterokanonische.html

Thank you for the "star", greetings and God's blessing!