Preheat the oven to 450 degrees F (230 degrees C).

Sift flour and baking soda together in a large bowl. Cut in shortening with 2 knives or pastry blender until mixture resembles coarse crumbs, making a well in the center.

Pour buttermilk into well; stir until a soft ball forms. Turn the dough out onto a lightly floured surface and knead for 2 to 3 minutes. Roll dough out into a 1/2-inch thick rectangle.

Cut out 12 biscuits with a biscuit cutter; transfer to a baking sheet.

Bake in the preheated oven until tops are light brown and sides begin to darken, about 10 minutes.