Agniveshyagrihyasutra 2.7.10.3

2.7.10.3

putramutpādya saṃskṛtya vedamadhyāpya vṛttiṃ vidhāya guṇavati putre kuḍumbabhāraṃ niyojya uttarāyaṇe pūrvapakṣe puṇye nakṣatre kuśacīracarmavalkalavāsā jaṭī kṛṣṇājinottarīyaḥ kṛtaprasthānaliṅgo 'gnimātmasamāropaṇaṃ kṛtvā sapatnīko vāpyapatnīko vā vanamāśrayet \

Having produced a son, having performed the sacraments for him, having taught him the Veda, having provided him a livelihood, and having entrusted the household burden to the virtuous son, during the northern course of the sun, in the bright fortnight, under an auspicious constellation, wearing garments of kuśa grass, rags, hides, or bark, matted-haired, having a black antelope skin as an upper garment, having assumed the marks of departure, having caused the fire to be internalized within himself, accompanied by his wife or without his wife, he should resort to the forest.