Garudapurana 1.150.6

1.150.6

preritaḥ prerayankṣudraṃ svayaṃ sa samalaṃ marut /
pratilomaṃ śirā gacchedudīrya pavanaḥ kapham //

impelling the minor [breath], that wind himself, laden with impurities, / goes in reverse direction into the channels, the wind exciting phlegm;