Who maketh his angels spirits; his ministers a flaming fire: עשה מלאכיו רחות oseh rnalachaiv ruchoth,
משרתיו אש להט mesharethaiv esh lohet.
The elements are described as prompt and expedite to perform the Divine commands, like angels or ministers serving in the tabernacle; the Hebrew word משרתיו mesharethaiv being a word most common in the sacred ministrations.