Place the beans in a Dutch oven; add water to cover by 2 in. Bring to a boil; boil for 2 minutes. Remove from the heat; cover and let stand for 1 hour. , Drain and rinse beans, discarding liquid. Set beans aside. In the same pan, cook the bacon over medium heat until crisp. Using a slotted spoon, remove to paper towels; drain, reserving 2 tablespoons drippings. , In the drippings, saute onion until tender. Stir in carrot and celery leaves. Return beans to the pan. Add water. Bring to a boil. Reduce heat; cover and simmer for 1-3/4 to 2 hours or until beans are tender. , Stir in the milk, molasses, salt and bacon. Remove about 2-1/2 cups of soup; cool slightly. Place in a blender or food processor; cover and process until pureed. Return to the pan; heat through.