स य एतदेवममृतं वेद रुद्राणामेवैकोभूत्वेन्द्रेणैव मुखेनैतदेवामृतं दृष्ट्वा तृप्यतिस एतदेव रूपमभिसंविशत्येतस्माद्रूपादुदेति ॥ ३ ॥
In plain words
Whoever realizes this immortal nectar in this very way becomes one with the Rudras. Seeing this very nectar through the mouth of Indra alone, he finds complete fulfillment. He merges directly into that form, and rises out of it once more.
Close to the Sanskrit
He who thus knows this immortal nectar, becoming one indeed of the Rudras, having seen this very immortal nectar through Indra's mouth alone, is satisfied. He enters fully into this very form, and rises up from this form.