Bhagavatapurana 2.2.13

2.2.13

ekaikaśo 'ṅgāni dhiyānubhāvayet pādādi yāvaddhasitaṃ gadābhṛtaḥ /
jitaṃ jitaṃ sthānam apohya dhārayet paraṃ paraṃ śuddhyati dhīryathā yathā //

13. One should gradually contemplate by force of Intellect (knowledge) the members one by one of the Divine Person of Sri Krishna, the wielder of gada, from the foot to the smiling countenance; and as the mind gets more and more clear and becomes steady, one should proceed from the member steadily seen (realised in meditation), to contemplate the member above it.