The Great Epic of the Bhārata dynasty 1.86.1

1.86.1

aṣṭaka uvāca |
carangṛhasthaḥ kathameti devānkathaṃ bhikṣuḥ kathamācāryakarmā |
vānaprasthaḥ satpathe saṃniviṣṭo bahūnyasminsaṃprati vedayanti || 1 ||

"Ashtaka said, 'Those cognisant of the Vedas differ in opinion as to how the followers of each of the four modes of life, viz., Grihasthas, Bhikshus, Brahmacharins, and Vanaprashthas, should conduct themselves in order to acquire religious merit."