Avatarika
पुत्रायुष उपासनमुक्त जपश्च ।अथेदानीमात्मन दीर्घजीवनायेदमुपासन जप च विदधदाह, जीवन्हि स्वय पुत्रादिफलेन युज्यते, नान्यथा ।इत्यत आत्मान यज्ञ सपादयति पुरुष —
In plain words
Meditation and recitation aimed at securing a son's life have already been explained. Now, prescribing this same meditation and recitation for one's own long life, the text declares: Only while living does a person attain the fruits starting with progeny, and not otherwise. Therefore, a person renders his very self a sacrifice.
Close to the Sanskrit
Meditation for the son's life and recitation have been spoken of. Now, prescribing this meditation and recitation for one's own long life, [the text] says: For a living person himself is joined with the fruit beginning with a son, not otherwise. Therefore a person accomplishes the self as a sacrifice—