Manava Dharmashastra 6.38

6.38

prājāpatyaṃ nirupyeṣṭiṃ vedasadakṣiṇām
ātmany agnīn samāropya brāhmaṇaḥ pravrajed gṛhāt //

Having performed the Ishti, sacred to the Lord of creatures (Pragapati), where (he gives) all his property as the sacrificial fee, having reposited the sacred fires in himself, a Brahmana may depart from his house (as an ascetic).