Shat.Upa 05.02

If a person meditates on a single measure, i.e. single syllable (of Om), he becomes realized through that and swiftly attains the realm of the human world in the universe. There, endowed with austerity, celibacy, and faith, he experiences true greatness.

Then, if he has the second measure or syllable (of 'Om') in the mind, he is led by the Yajur Veda to the sky, to the world of Soma. There, having experienced special opulences, he returns again.

Whoever meditates on the Supreme Being using the syllable 'Om', which consists of three parts (Ā, Ū, M), becomes enlightened by the sun's light and is liberated just as a snake sheds its skin. In this way, he is truly freed from sin and ascends with the hymns to the realm of Brahman. In this dense existence of beings, he perceives the Supreme Being residing within the physical bodies of beings, who transcends.

Bhāṣya 05.02

By meditating on Lord Hari with the syllable 'Om', one attains knowledge from Lord Brahma after reaching Brahmaloka, and is liberated.

By meditating on Lord Hari with the syllable 'Om' and reaching Brahmaloka, one attains knowledge from Lord Brahma and is liberated without any doubt.