Chānd-Mül, 1879-841. THIRTEENTH KHANDA
Then the Ahavanaya fire taught him: 'Breath, ether, heaven, and lightning (these are my forms). The person that is seen in the lightning, I am he, I am he indeed.
Chānd-Śaṃ, 8th c. A.D.atha hainamanvāhāryapacano ’nuśaśāsa dakṣiṇāgnirāpo diśo nakṣatrāṇi candramā ityetā mama catasrastanavaścaturdhāhamanvāhāryapacana ātmānaṃ pravibhajyāvasthitaḥ tatra ya eṣa candramasi puruṣo dṛśyate so ’hamasmi sa evāhamasmīti pūrvavat | annasambandhājjyotiṣṭvasāmānyāccānvāhāryapacanacandramasorekatvandakṣiṇā(ṇa) diksambandhācca | apāṃ nakṣatrāṇāṃ ca pūrvavadannatvenaiva sambandhaḥ | nakṣatrāṇāṃ candramaso bhogyatvaprasiddheḥ | apānnotpādakatvādannatvaṃ dakṣiṇāgneḥ pṛthivīvadgārhapatyasya | samānamanyat || 1-2 || iti cchāndogyopaniṣadi caturthādhyāyasya dvādaśaḥ khaṇḍaḥ
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