to set an example; to lead by example
Heureusement que t'es là pour lui montrer l'exemple.
Good thing you're here to set an example for him.
— Demain tout commence (2016)
Try to set an example.
Tu vas devoir prouver ta valeur, montrer l'exemple.
You're going to have to prove your worth, lead by example.
Ils ont tué Tom pour montrer l'exemple aux autres prisonniers.
They killed Tom to set an example for the other prisoners.
I had to set an example.
Du fait que vous soyez l'aîné, vous devez montrer l'exemple.
Since you’re the eldest, you must set an example.