Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 39

Sanskrit:

ऋणैस्‍त्रिभिर्द्विजो जातो देवर्षिपितृणां प्रभो ।यज्ञाध्ययनपुत्रैस्तान्यनिस्तीर्य त्यजन् पतेत् ॥ ३९ ॥

ITRANS:

ṛṇais tribhir dvijo jātodevarṣi-pitṝṇāṁ prabhoyajñādhyayana-putrais tānyanistīrya tyajan patet

Translation:

Dear Prabhu, a member of the twice-born classes is born with three kinds of debts — those owed to the demigods, to the sages and to his forefathers. If he leaves his body without first liquidating these debts by performing sacrifice, studying the scriptures and begetting children, he will fall down into a hellish condition.

Purport:

Concerning the special obligations of a brāhmaṇa, the śruti states, jāyamāno vai brāhmaṇas tribhir ṛṇavāñ jāyate brahmacaryeṇa ṛṣibhyo yajñena devebhyaḥ prajayā pitṛbhyaḥ: “Whenever a brāhmaṇa takes birth, three debts are born along with him. He can pay his debt to the sages by celibacy, his debt to the demigods by sacrifice, and his debt to his forefathers by begetting children.”