We worship the good, strong, beneficent Fravashis [guardian spirits] of
the faithful; with helms of brass, with weapons (45) of brass, with
armor of brass; who struggle in the fights for victory in garments of
light, arraying the battles and bringing them forwards, to kill
thousands of Dævas [demons]. 46. When the wind blows from behind them
and brings their breath unto men, then men know where blows the breath
of victory: and they pay pious homage unto the good, strong, beneficent
Fravashis of the faithful, with their hearts prepared and their arms
uplifted. 47. Whichever side they have been first worshiped in the
fulness of faith of a devoted heart, to that side turn the awful
Fravashis of the faithful along with Mithra [angel of truth and light]
and Rashnu [Justice] and the awful cursing thought of the wise and the
victorious wind.
Yasht xiii. 45-47: Translation of J. Darmesteter.