Description of unified field in Atharva Veda

Atharva 2.1

वेनस्तत्पश्यत्परमं गुहा यद्यत्र विश्वं भवत्येकरूपम् ।

इदं पृश्निरदुहज्जायमानाः स्वर्विदो अभ्यनूषत व्राः ॥१॥

प्र तद्वोचेदमृतस्य विद्वान् गन्धर्वो धाम परमं गुहा यत्।

त्रीणि पदानि निहिता गुहास्य यस्तानि वेद स पितुष्पितासत्॥२॥

स नः पिता जनिता स उत बन्धुर्धामानि वेद भुवनानि विश्वा ।

यो देवानां नामध एक एव तं संप्रश्नं भुवना यन्ति सर्वा ॥३॥

परि द्यावापृथिवी सद्य आयमुपातिष्ठे प्रथमजामृतस्य ।

वाचमिव वक्तरि भुवनेष्ठा धास्युरेष नन्वेषो अग्निः ॥४॥

परि विश्वा भुवनान्यायमृतस्य तन्तुं विततं दृशे कम् ।

यत्र देवा अमृतमानशानाः समाने योनावध्यैरयन्त ॥५॥

The seer perceived that supreme reality hidden in the depths, where the entire universe exists in a single unified form. From that source, the radiant energy brought forth all that is born, and those who know the path to the higher realm followed it with insight.

One who knows the immortal truth may proclaim it: the celestial knower reveals that highest abode hidden within. Three stages of existence are placed within that mystery; whoever understands them becomes the ancestor of ancestors.

He (Iswar Yayu 40.1) is our father, our begetter, and also our kin. He knows all abodes and all worlds. He alone assigns names to the divine powers, and all realms move toward him in inquiry.

He immediately encompassed both heaven and earth and stood as the first-born of immortality. Established in the worlds like speech in a speaker, this presence is truly fire, ever seeking and ever knowing.

He surrounds all worlds and spreads the thread of immortality so it may be perceived. There, the divine powers, sharing in immortality, were born together from the same source.