Dvadashakshari Mantra

Deity / focus: Lord Vishnu / Krishna

ॐ नमो भगवते वासुदेवाय॥
Oṃ namo bhagavate vāsudevāya.

MEANING:
Salutations to the Divine Lord Vasudeva, who dwells in all beings.

SOURCE & PRACTICE:
The twelve-syllable mantra of devotion, revered in the Srimad Bhagavatam; ideal on Ekadashi.