The Compendium of Caraka 3.8.11

3.8.11

tamupasthitamājñāya same śuvau deśe *prākpravaṇe udakpravaṇe vā catuṣkiṣkumātraṃ caturasraṃ sthaṇḍilaṃ gomayodakenopaliptaṃ kuśāstīrṇaṃ *suparihitaṃ paridhibhiścaturdiśaṃ yathoktacandanodakumbhakṣaumahemahiraṇyarajatamaṇimuktāvidrumālaṅkṛtaṃ medhyabhakṣyagandhaśuklapuṣpalājasarṣapākṣatopaśobhitaṃ kṛtvā, tatra pālāśībhiraiṅgudībhiraudumbarībhirmādhukībhirvā samidbhiragnimupasamādhāya prāṅmukhaḥ śuciradhyayanavidhimanuvidhāya madhusarpirbhyāṃ tristrirjuhuyādagnimāśīḥsaṃprayukairmantrairbrahmāṇamagniṃ dhanvantariṃ prajāpatimaśvināvindramṛṣīṃśca sūtrakārānabhimantrayamāṇaḥ pūrvaṃ svāheti//

Having known him to be present, [the teacher,] in an even and clean place sloping toward the east or sloping toward the north, having made an altar measuring four kiṣkus, square, smeared with cow dung and water, strewn with kuśa grass, well enclosed on all four sides with fencing sticks, adorned with sandalwood, water jars, linen, gold, silver, gems, pearls, and coral as described, and graced with wholesome edible foods, perfumes, white flowers, parched grain, mustard seeds, and unbroken grains; having established the fire there with fire-sticks of palāśa, ingudī, udumbara, or madhūka; facing east, pure, and having complied with the rule for study, should offer oblation three times each into the fire with honey and ghee with mantras endowed with blessings, addressing first Brahmā, Agni, Dhanvantari, Prajāpati, the two Aśvins, Indra, and the ṛṣis who are authors of the sūtras, saying: 'svāhā'.