Rig Veda II.4 is dedicated to Agni. RV II.4.2 says as follows:
इमं विधन्तो अपां सधस्थे दवितादधुर्भ्र्गवो विक्ष्वायोः | एष विश्वान्यभ्यस्तु भूमा देवानामग्निररतिर्जीराश्वः ||
Translation of H.H. Wilson is as follows:
The BHRIGUS. Worshipping AGNI, have twice made him manifest : (once) in the Abode of the waters, and (once) amongst the sons of men: may that AGNI, the sovereign of the Gods, mounted on a rapid courser, ever overcome all (our foes)
So far I am under the impression that incarnations of Vishnu or Shiva, etc, are the fabrication of poets of post Vedic literature and of part of Puranas.
However, Rig Veda Mandala II was accepted by many to be the oldest part of the Veda. And, it is speaking about manifestation of AGNI, the sovereign of the Gods, amongst the sons of men.
Can anyone explain whether we can take it as the incarnation of AGNI among men, in the ancient period or does it indicate something else?