स य एतदेवममृतं वेद वसूनामेवैको भूत्वाग्निनैव मुखेनैतदेवामृतं दृष्ट्वा तृप्यति स एतदेव रूपमभिसंविशत्येतस्माद्रूपादुदेति ॥ ३ ॥
In plain words
Whoever knows this nectar just as it is, and becoming one with the Vasus, finds deep contentment by beholding this very nectar through the mouth of fire—they merge completely into that form, and from that very form they rise again.
Close to the Sanskrit
He who thus knows this very nectar, having become one alone of the Vasus, being satisfied by seeing this very nectar through Agni alone as the mouth, enters completely into this very form, and rises up from this very form.