Preheat a large pot or Dutch oven to medium heat and add the olive oil.
Add the onion, celery and carrots to the pot and cook for 3-4 minutes before adding the garlic. Continue to sauté for another minute or until the garlic is fragrant.
Add the remaining ingredients except for the alphabet pasta to the pot and bring to a boil.
When the soup is boiling, add the alphabet pasta to the pot and cook until the pasta and vegetables are tender, about 20 minutes.