Bhashya
इदं वै तन्मध्विति पूर्ववत् ।उक्तौ द्वौ मन्त्रौ प्रवर्ग्यसं-बन्धव्याख्यायिकोपसंहर्तारौ ; द्वयोः प्रवर्ग्यकर्मार्थयोरध्याययो-रर्थ आख्यायिकाभूताभ्यां मन्त्राभ्यां प्रकाशितः ।ब्रह्मविद्या-र्थयोस्त्वध्याययोरर्थ उत्तराभ्यामृग्भ्यां प्रकाशयितव्य इत्यतःप्रवर्तते ।यत् कक्ष्यं च मधु उक्तवानाथर्वणो युवाभ्यामित्यु-क्तम्- किं पुनस्तन्मध्वित्युच्यते- पुरश्चक्रे, पुरः पुराणिशरीराणि- यत इयमव्याकृतव्याकरणप्रक्रिया- स परमे-श्वरो नामरूपे अव्याकृते व्याकुर्वाणः प्रथमं भूरादीन्लोकान्सृष्ट्वा, चक्रे कृतवान्, द्विपदः द्विपादुपलक्षितानिमनुष्यशरीराणि पक्षिशरीराणि ; तथा पुरः शरीराणिचक्रे चतुष्पदः चतुष्पादुपलक्षितानि पशुशरीराणि ; पुरःपुरस्तात् , स ईश्वरः पक्षी लिङ्गशरीरं भूत्वा पुरःशरीराणि- पुरुष आविशदित्यस्यार्थमाचष्टे श्रुतिः- सवा अयं पुरुषः सर्वासु पूर्षु सर्वशरीरेषु पुरिशयः,पुरि शेत इति पुरिशयः सन् पुरुष इत्युच्यते ; नएनेन अनेन किंचन किंचिदपि अनावृतम् अनाच्छादितम् ;तथा न एनेन किंचनासंवृतम् अन्तरननुप्रवेशितम्- बाह्य-भूतेनान्तर्भूतेन च न अनावृतम् ; एवं स एव नामरूपा-त्मना अन्तर्बहिर्भावेन कार्यकारणरूपेण व्यवस्थितः ; पुर-श्चक्रे इत्यादिमन्त्रः संक्षेपत आत्मैकत्वमाचष्ट इत्यर्थः ॥
In plain words
'This is the honeyed teaching' — as before. The two mantras just given bring the Pravargya story to its close, and between them lay open the meaning of the two chapters devoted to that rite. But the meaning of the two chapters devoted to the knowledge of brahman still needs the next two verses to bring it to light — and that is where the text now turns. It was said that Dadhyañc gave you both the secret teaching too. What is it? Here is the answer: 'he made bodies' — puraḥ means bodies, because this whole passage describes how the undifferentiated comes to be differentiated. The supreme Lord, giving shape to name and form that had been undifferentiated, first brought the worlds into being, earth and the rest, and then made bodies — two-footed ones, marked by two feet: human bodies and bird bodies. In the same way he made four-footed bodies, marked by four feet: the bodies of animals. Then — before all that — the Lord, having become a bird, that is, the subtle body, entered those bodies. Scripture explains what 'the person entered' means: 'he, this very person, lying in the body, in every single body there is' — because he lies in the body, he is called the one who dwells there, the person. 'Not by this' means 'not by him'; 'anything whatsoever' means literally anything at all; 'left uncovered' means left unconcealed. In the same way, 'nothing is left unenclosed by him' means nothing stands outside what he has entered. Nothing, inside or outside, escapes being covered by him. In this way he alone stands as everything — as name and form, as what is within and what is without, as cause and as effect. This mantra, 'he made bodies,' is teaching, in a single stroke, the oneness of the self. That is its meaning.
Close to the Sanskrit
'This indeed is that madhu' — as before. The two mantras stated are the two that bring to a close the story connected with the Pravargya. The meaning of the two chapters concerned with the Pravargya rite has been made manifest by the two mantras forming that story. But the meaning of the two chapters concerned with the knowledge of brahman is to be made manifest by the next two verses; therefore the text now proceeds to them. It was said that the descendant of Atharvan told you two the secret madhu as well — what, then, is that madhu? It is explained: 'he made bodies' — 'puraḥ' means bodies; since this passage is the process by which the undifferentiated is differentiated, that supreme Lord, differentiating name-and-form which were undifferentiated, having first created the worlds beginning with the earth, made — 'cakre' meaning 'he made'; 'dvipadaḥ' means bodies marked by two feet, human bodies and bird bodies; likewise he made bodies that are four-footed, bodies marked by four feet, animal bodies. 'Puraḥ' here means 'beforehand'; that Lord, having become a bird — that is, the subtle body — entered the bodies. Scripture states the meaning of 'the person entered' thus: 'he indeed, this person, in all bodies, every body, is the one who lies in the body' — since he lies in the body, being 'one who lies in the body', he is called 'person'. 'Not by this' means 'not by this one'; 'anything whatsoever' means 'anything at all'; 'uncovered' means 'not covered'. Likewise 'not by this is anything unenclosed' means 'not entered within'; by what is external and what is internal alike, nothing is left uncovered. Thus he alone stands established, in the nature of name-and-form, in the state of being both within and without, in the form of effect and cause. The mantra 'he made bodies' and so on declares, in brief, the oneness of the self — this is the meaning.