Śrīmad-Bhāgavatam · Texts 6.5.27-28
Who is speaking and story frame
अब्भक्षा: कतिचिन्मासान् कतिचिद्वायुभोजना: ।
आराधयन् मन्त्रमिममभ्यस्यन्त इडस्पतिम् ॥ २७ ॥
ॐ नमो नारायणाय पुरुषाय महात्मने ।
विशुद्धसत्त्वधिष्ण्याय महाहंसाय धीमहि ॥ २८ ॥
ab-bhakṣāḥ katicin māsān
katicid vāyu-bhojanāḥ
ārādhayan mantram imam
abhyasyanta iḍaspatim
oṁ namo nārāyaṇāya
puruṣāya mahātmane
viśuddha-sattva-dhiṣṇyāya
mahā-haṁsāya dhīmahi
For a few months the sons of Prajāpati Dakṣa drank only water and ate only air. Thus undergoing great austerities, they recited this mantra: “Let us offer our respectful obeisances unto Nārāyaṇa, the Supreme Personality of Godhead, who is always situated in His transcendental abode. Since He is the Supreme Person [paramahaṁsa], let us offer our respectful obeisances unto Him.”
Read Śrīla Prabhupāda's purport on Vedabase.io