I killed him to teach him a lesson.

我杀了他是为了教训他。

youdao

We have decided to teach him a lesson.

大家决定治治他。

youdao

We've decided to teach him a lesson.

大家决定治治他。

《新英汉大辞典》

In doing so, you teach him a lesson and make him an example to everyone else.

FORBES: Retaliation: A Guide for Vindictive Bosses

Half the crowd, I suspect, really did expect Alonso to drive straight into the back of the Briton at the first corner just to teach him a lesson.

BBC: Feeling the tension at Interlagos

Financial firms have placed plenty of emphasis on prepaid debit in recent years, touting the payment method as a tool for parents to keep Junior's spending in check and perhaps teach him a lesson in money management.

WSJ: Baby, Baby: Prepaid Debit Cards No Cause for Teens to Scream