Srimad-Bhagavatam: Canto 6 - Chapter 1 - Verse 28

Sanskrit:

वृद्धावनाथौ पितरौ नान्यबन्धू तपस्विनौ ।अहो मयाधुना त्यक्तावकृतज्ञेन नीचवत् ॥ २८ ॥

ITRANS:

vṛddhāv anāthau pitaraunānya-bandhū tapasvinauaho mayādhunā tyaktāvakṛtajñena nīcavat

Translation:

My father and mother were old and had no other son or friend to look after them. Because I did not take care of them, they lived with great difficulty. Alas, like an abominable lower-class man, I ungratefully left them in that condition.

Purport:

According to Vedic civilization, everyone has the responsibility for taking care of brāhmaṇas, old men, women, children and cows. This is the duty of everyone, especially an upper-class person. Because of his association with a prostitute, Ajāmila abandoned all his duties. Regretting this, Ajāmila now considered himself quite fallen.