Fry the bacon in a saucepan until crispy. Add onions, garlic, celery and carrots and fry for 5 minutes. Now add the chickpeas with their juice, beef broth, oil and tomato paste and bring the soup to a boil. Let simmer for about 10 minutes. Season with salt and pepper and stir in the parsley.
Toast the bread slices, rub with a halved clove of garlic as desired and serve with the soup.