Śira-upaniṣad · Verses 44-45

vyāpako hi bhagavān rudro bhogāyamāno yadā śete rudras tadā saṃhāryyate prajāḥ /
ucchvasite tamo bhavati tamasa āpo 'psv aṅgulyā mathite mathitaṃ śiśire śiśiraṃ mathyamānaṃ phenaṃ bhavati phenād aṇḍaṃ bhavaty aṇḍād brahmā bhavati brahmaṇo vāyuḥ vāyor oṃkāraḥ oṃkārāt sāvitrī sāvitryā gāyatrī gāyatryā lokā bhavanti /
arcayanti tapaḥ satyaṃ madhu kṣaranti yad dhruvam /
etaddhi paramaṃ tapaḥ /
āpo jyotī raso 'mṛtaṃ brahma bhūr bhuvaḥ svar oṃ nama iti //

ya idam atharvaśiro brāhmaṇo 'dhīte aśrotriyaḥ śrotriyo bhavati anupanīta upanīto bhavati so 'gnipūto bhavati sa vāyupūto bhavati sa sūryapūto bhavati sa somapūto bhavati sa satyapūto bhavati sa sarvair devair jñāto bhavati sa sarvair vedair anudhyāto bhavati sa sarveṣu tīrtheṣu snāto bhavati tena sarvaiḥ kratubhir iṣṭaṃ bhavati gāyatryāḥ ṣaṣṭisahasrāṇi japtāni bhavanti itihāsapurāṇānāṃ rudrāṇāṃ śatasahasrāṇi japtāni bhavanti /
praṇavānām ayutaṃ japtaṃ bhavati /
sa cakṣuṣaḥ paṅktiṃ punāti /
ā saptamāt puruṣayugān punātīty āha bhagavān atharvaśiraḥ sakṛj japtvaiva śuciḥ sa pūtaḥ karmaṇyo bhavati /
dvitīyaṃ japtvā gaṇādhipatyam āpnoti /
tṛtīyaṃ japtvaivam evānupraviśaty oṃ satyam oṃ satyam oṃ satyam /
ity atharvavede śiraupaniṣat samāptā //