Combine stuffing with hot water. Break sausage into small pieces. Add to moistened stuffing. Stir in onions, celery, egg and baking soda until blended. Shape into balls using 1/4 cup. Place on baking sheet. Cover with foil tightly. Bake at 325ºF. for 15 minutes. Remove foil. Increase oven temperature to 350ºF. Bake 25 minutes or until sausage is done.