Asura in the Veda is not applied to Varuna alone.

But in the Avesta, Ahura is the one great spirit, and his six spirits are plainly a protestant copy and modification of Varuna and his six underlings.

This, then, can mean--which stands in concordance with the other parallels between the two religions--only that Zarathustra borrows the Ahura idea from the Vedic Aryans at a time when Varuna was become superior to the other gods, and when the Vedic cult is established in its second phase[27].

To this fact points also the evidence that shows how near together geographically were once the Hindus and Persians.

Whether one puts the place of separation at the Kabul or further to the north-west is a matter of indifference.