Heat olive oil in a large skillet.Add onion, celery, and carrot.Cook, stirring as needed, until softened, about 5-10 minutes.Add garlic, and cook, stirring frequently, for 30 seconds.Stir in tomato paste, and cook, stirring it in, for 1 minutes.Add tomato sauce, diced tomatoes with juice, basil, oregano, baking soda, and salt and pepper to taste.Stir in lentils and water.Simmer, stirring regularly, until lentils have softened, about 20-30 minutes.