3 sentences for 者 (zhě — topic marker)

1. 欲王天下者，必先修其德。

   yù wàng tiān​xià zhě, bì xiān xiū qí dé.

   Those who wish to rule the world must first cultivate their virtue.

   Source: Dong Chinese Dictionary

2. 所谓“仁”者，爱人也。

   suǒ​wèi“ rén” zhě, ài​rén yě.

   The so-called "benevolent" person is one who loves others.

   Source: Dong Chinese Dictionary

3. 师者，所以传道受业解惑也。

   shī zhě, suǒ​yǐ chuán​dào shòu​yè jiě​huò yě.

   A teacher is one who transmits the Way, imparts knowledge, and resolves doubts.

   Source: Dong Chinese Dictionary