Vishnupurana 3.9.32

3.9.32

kṛtvāgnihotraṃ svaśarīrasaṃsthaṃ śārīram agniṃ svamukhe juhoti
vipras tu bhikṣopagatair havirbhiś citāgninā sa vrajati sma lokān //

"The fourth order of men is called that of the mendicant; the circumstances of which it is fit, oh king, that you should hear from me. Let the unimpassioned man, relinquishing all affection for wife, children, and possessions, enter the fourth order. Let him forego the three objects of human existence (pleasure, wealth, and virtue), whether secular or religious, and, indifferent to friends, be the friend of all living beings. Let him, occupied with devotion, abstain from wrong, in act, word, or thought, to all creatures, human or brute; and equally avoid attachment to any. Let him reside but for one night in a village, and not more than five nights at a time in a city; and let him so abide, that good-will, and not animosity, may be engendered. Let him, for the support of existence, apply for alms at the houses of the three first castes, at the time when the fires have been extinguished, and people have eaten. Let the wandering mendicant call nothing his own, and suppress desire, anger, covetousness, pride, and folly. The sage who gives no cause for alarm to living beings need never apprehend any danger from them. Having deposited the sacrificial fire in his own person, the Brahman feeds the vital flame, with the butter that is collected as alms, through the altar of his mouth; and by means of his spiritual fire he proceeds to his own proper abode. But the twice-born man, who seeks for liberation, and is pure of heart, and whose mind is perfected by self-investigation, secures the sphere of Brahmá, which is tranquil, and is as a bright flame that emits not smoke."