དེ་ལ་ཕྱི་རོལ་གྱི་མེའི་ཁམས་གང་ཞེ་ན།
The heat of a fire, the sun, and precious gems, as well as the heat produced by grains, medicinal plants, trees, grass, dung, and dust, are referred to as the external fire element.
Emptiness, Elements, Tathagatas