Ashtangasamgraha 49.12

49.12

tasyāṃ rasāyanārthī śaradi vasante vā śuklapakṣe praśaste ahani pūjayitvā yathārhaṃ devaguruviprān praṇamya brahmadakṣāśviprabhṛtīn parimṛśya suvarṇaghṛtamadhusiddhārthakapriyaṅgurocanāḥ pradakṣiṇīkṛtya gobrāhmaṇānanu praviśet ||

In that [cottage], one who desires a rasāyana should enter in autumn or spring, during the bright fortnight, on an auspicious day, after duly worshiping gods, teachers, and brāhmaṇas, bowing to Brahmā, Dakṣa, the Aśvins, and others, touching gold, ghee, honey, white mustard seeds, priyaṅgu, and yellow orpiment, and circumambulating cows and brāhmaṇas.