Awake, O Dawn, the Horsemen, goddess, kind and great....

When, O Dawn, thou goest in light and shinest with the Sun, then hither comes the Horsemen's chariot, to the house men have to protect.
When the swollen _soma_-stalks are milked like cows with udders, and when the choric songs are sung, then they that adore the Horsemen are preeminent....
Here the Acvins are associated with Indra, and even find the evil demon; but, probably, at this stage Indra is more than god of storms.
Some of the expanded myths and legends of the Acvins may be found in i.

118, 119, 158; x.40.Here follows one with legends in moderate number (vii.

71): Before the Dawn her sister, Night, withdraweth; The black one leaves the ruddy one a pathway.
Ye that have kine and horses, you invoke we; By day, at night, keep far from us your arrow.
Come hither, now, and meet the pious mortal, And on your car, O Horsemen, bring him good things; Keep off from us the dry destroying sickness, By day, at night, O sweetest pair, protect us.
Your chariot may the joy-desiring chargers, The virile stallions, bring at Dawn's first coming; That car whose reins are rays, and wealth upon it; Come with the steeds that keep the season's order.
Upon the car, three-seated, full of riches, The helping car, that has a path all golden, On this approach, O lords of heroes, true ones, Let this food-bringing car of yours approach us.
Ye freed from his old age the man Cyav[=a]na; Ye brought and gave the charger swift to Pedu; Ye two from darkness' anguish rescued Atri; Ye set J[a=]husha down, released from fetters.[118] This prayer, O Horsemen, and this song is uttered; Accept the skilful[sic] poem, manly heroes.
These prayers, to you belonging, have ascended, O all ye gods protect us aye with blessings![119] The sweets which the Acvins bring are either on their chariot, or, as is often related, in a bag; or they burst forth from the hoof of their steed.

Pegasus' spring in Helicon has been compared with this.