Om Namo Bhagavate Vasudevaya

Om Namo Bhagavate Vasudevaya ( listen ) (in devanagari: ॐ नमो भगवते वासुदेवाय) is a Hindu mantra. ‘Om Namo Bhagavate Vasudevaya’ is a mantra of Vishnu and Krishna both. It has two traditions—Tantric and Puranic. In Tantrik Tradition, the Rishi of the Mantra is Prajapati, in Puranic Tradition the Rishi is Narada. Both, however, say it is the Supreme Vishnu Mantra. Sharada Tilak Tantram, for example, says "Dvadasharno mahamantrah pradhano Vaishnavagame"—the twelve lettered mantra is the chief among vaishnava mantras. Similarly, this is the ultimate mantra in ShrimadBhagavatam, whose 12 Chapters are taken as extensions of the 12 Letters of this Mantra. This twelve syllable mantra is known as a Mukti (liberation) mantra and a spiritual formula for attaining freedom. This can be chanted like Gayatri Mantra. This is the principal mantra of the Vedic scripture "Srimad Bhagavatam". This mantra can also be found in Vishnu Purana.

Om Namo Bhagavate Vasudevaya means "Om, I bow to Lord Vasudeva or Lord Krishna".

Om Namo Bhagavate Vasudevaya means "prostration to Krishna" or "surrender to Krishna." Krishna himself asked his devotees to completely surrender to him:

अहं त्वां सर्वपापेभ्यो मोक्षयिष्यामि मा शुचः ॥१८- ६६॥
Translation Abandon all varieties of religion and just surrender unto Me. I shall deliver you from all sinful reaction. Do not fear. [Gita 18/66]

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Wikipedia