Shat.Upa 05.02
स यद्येकमात्रमभिध्यायीत स तेनैव संवेदितस्तूर्णमेव जगत्यामभिसम्पद्यते। तमृचो मनुष्यलोकमुपनयन्ते। स तत्र तपसा ब्रह्मचर्येण श्रद्धया सम्पन्नो महिमानमनुभवति॥
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.
अथ यदि द्वितीयमात्रेण मनसि सम्पद्यते सोऽन्तरिक्षं यजुर्भिरुन्नीयते सोमलोकम्। स सोमलोके विभूतिमनुभूय पुनरावर्तते॥
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.
यः पुनरेतं त्रिमात्रेणोमित्येतेनैवाक्षरेण परं पुरुषमभिध्यायीत स तेजसि सूर्ये सम्पन्नो यथा पादोदरस्वचा विनिर्मुच्यते एवं ह वै स पाप्मना विनिर्मुक्तः स सामभिरुन्नीयते ब्रह्मलोकम्। स एतस्माज्जीवघनात् परात्परं पुरिशयं पुरुषमीक्षते ॥२॥
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.
प्रणवेन हरिं ध्यायन् ब्रह्मलोकं समेत्य च। ज्ञानं चतुर्मुखात्प्राप्य मुच्यते नात्र संशयः ॥
By meditating on Lord Hari with the syllable 'Om' and reaching Brahmaloka, one attains knowledge from Lord Brahma and is liberated without any doubt.