Śatapatha Brāhmaṇa ("of a hundred paths") 2.4.2.24

2.4.2.24

atha nīvimudvṛhya namaskaroti | pitṛdevatyā vai nīvistasmānnīvimudvṛhya namaskaroti yajño vai namo yajñiyānevainānetatkaroti ṣaṭ kṛtvo namaskaroti ṣaḍvā ṛtava ṛtavaḥ pitarastasmātṣaṭ kṛtvo namaskaroti gṛhānnaḥ pitaro datteti gṛhāṇāṃ ha pitara īśata eṣo etasyāśīḥ karmaṇo 'thāvajighrati pratyavadhāya piṇḍāntsa yajamānabhāgo 'gnau sakṛdācinnānyabhyādadhāti punarulmukamapi sṛjati

He then pulls down the tuck (of the sacrificer's garment) and performs obeisance. The tuck is sacred to the fathers (pitridevatyâ): therefore he performs obeisance to them after pulling down the tuck. Now obeisance means worship (or sacrifice): hence he thereby renders them worthy of worship. Six times he performs obeisance; for there are six seasons, and the fathers are the seasons: for this reason he performs obeisance six times. He mutters (Vâg. S. II, 32 g), 'Give us houses, O fathers!' for the fathers are the guardians (îsate) of houses; and this is the prayer for blessing at this sacrificial performance. After the cakes have been put back (in the dish containing the remains of boiled rice) he (the sacrificer) smells at (the rice); this (smelling) being the sacrificer's share. The (stalks of sacrificial grass) cut with one stroke he puts on the fire; and he also again throws away the firebrand.