Laravel findOrFail does not exist

When I use findOrFail in my code it doesn't work

I've tried the find method and it works as I expected

public function show(Question $question, Reply $reply) {
    return $question->replies->findOrFail($reply->id);
}

BadMethodCallException: Method Illuminate\Database\Eloquent\Collection::firstOrFail does not exist. in file

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