Garudapurana 1.32.30

1.32.30

daṃ stotraṃ japetpaścādvāsudevamanusmaran /
oṃ namo vāsudevāya namaḥ sakarṣaṇāya ca //

Then one should recite this hymn, meditating upon Vāsudeva: / ‘Oṃ, obeisance to Vāsudeva, and obeisance to Saṃkarṣaṇa;