Markandeyapurana 42.8

42.8

apramattena veddhavyaṃ śaravattanmayo bhavet /
omityetat trayo vedāstrayo lokāstrayo 'gnayaḥ //

As the syllable Om being pronounced reaches the head, the yogi who is lost in meditation of Om should become united with Brahma, the Supreme Soul. Life is his bow, the soul is his arrow, Brahma is the target sublime. It is to be pierced by the heedful man; he should be united with Brahma, as the arrow becomes embedded in the target.

The syllable Om, consisting of three and a half instants, should be known in its true sense as the three Vedas—the Ṛc, Sāma and Yajus—the three worlds, the three fires, and the three deities Viṣṇu, Brahmā and Śiva. And the yogi, who is absorbed in religious meditation thereon, may obtain extinction therein.