The Compendium of Caraka 8.7.64

8.7.64

āpādatalamūrdhasthān doṣān pakvāśaye sthitaḥ/
vīryeṇa bastirādatte khastho 'arko bhūrasāniva//

Staying in the colon, the enema draws out morbid matters located from the soles of the feet to the head / by its potency, just as the sun in the sky draws up the juices of the earth.