This is Agni's threefold birth; and all the holy character of three is exhausted in application where he is concerned.

It is the highest mystery until the very end of the Vedic age.

This Agni it is that is the real Agni of the Rig Veda--the new Agni; for there was probably an Agni cult (as simple fire) long before the _soma_ cult.
Indra and Agni are one, and both are called the slayers of the demons[1].

They are both united as an indissoluble pair (iii.

12, etc.).