Mimamsasutra 42.2.23-3.p1

42.2.23-3.p1

jyotiṣṭoma vikalpitaṃ pṛṣṭhastotraṃ vihitam- ’bṛhatpṛṣṭhaṃ bhavati| rathaṃtaraṃ pṛṣṭhaṃ bhavati’ iti| tatromayatra dharmāḥ śrutāḥ- ’bṛhati stūyamāne manasā samudraṃ dhyāyet | rathaṃtare prastūyamāne saṃnī(mī) layet’ ityādayaḥ| te hyubhayatra saṃkīryaran| pṛṣṭharsiḍhḍhalakṣaṇasya kāryasyaikatvāt| iti cet|

In the Jyotiṣṭoma, the Pṛṣṭha-stotra is enjoined as an optional alternative: 'The Bṛhat is the Pṛṣṭha; the Rathaṃtara is the Pṛṣṭha.' In that connection, ritual details are directly stated for both: 'When the Bṛhat is being chanted, one should meditate on the ocean with the mind'; 'When the Rathaṃtara is being commenced, one should close one's eyes', and so forth. These should indeed be intermingled in both cases, because the effect characterized as accomplishing the Pṛṣṭha is one. If it is argued thus—