Skandapurana 5.260.57

5.260.57

.. īśvara uvāca .. ..
akṣaratrayasaṃyukto mantro'yaṃ sakṛdakṣaraḥ ..
māghamāsahitaścāyamamākṣohenaścāyamamāyo viśvapāvanaḥ ..
viṣṇugamyo viṣṇu madhyo mantratrayasamanvitaḥ ..
turīyakalayā'śeṣabrahmāṃḍagaṇasevitaḥ 57 ..

Īśvara said: / This mantra, composed of three syllables, is imperishable when uttered once. / It is beneficial in the month of Māgha, free from agitation, free from illusion, the purifier of the universe; / attainable by Viṣṇu, centered on Viṣṇu, endowed with three mantras, / served by the entire host of universes through its fourth digit. (56–57)